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Hydraulic modeling and optimization of jet mill bit considering the characteristics of depressurization and cuttings cleaning
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作者 Tong Cao Xu-Yue Chen +1 位作者 Kai-An Yu Lin Tang 《Petroleum Science》 SCIE EI CSCD 2023年第5期3085-3099,共15页
A jet mill bit(JMB)is proposed to increase the drilling efficiency and safety of horizontal wells,which has the hydraulic characteristics of depressurization and cuttings cleaning.This paper fills the gap in the hydra... A jet mill bit(JMB)is proposed to increase the drilling efficiency and safety of horizontal wells,which has the hydraulic characteristics of depressurization and cuttings cleaning.This paper fills the gap in the hydraulic study of the JMB by focusing on the hydraulic modeling and optimization of the JMB and considering these two hydraulic characteristics.First,the hydraulic depressurization model and the hydraulic cuttings cleaning model of the JMB are developed respectively.In the models,the pressure ratio and efficiency are chosen as the evaluation parameters of the depressurization capacity of the JMB,and the jet hydraulic power and jet impact force are chosen as the evaluation parameters of cuttings cleaning capacity of the JMB.Second,based on the hydraulic models,the effects of model parameters[friction loss coefficient,target inclination angle,rate of penetration(ROP),flow ratio,and well depth]on the hydraulic performance of the JMB are investigated.The results show that an increase in the friction loss coefficient and target inclination angle cause a significant reduction in the hydraulic depressurization capacity,and the effect of ROP is negligible.The flow ratio is positively related to the hydraulic cuttings cleaning capacity,and the well depth determines the maximum hydraulic cuttings cleaning capacity.Finally,by combining the hydraulic depressurization model and hydraulic cuttings cleaning model,an optimization method of JMB hydraulics is proposed to simultaneously maximize the jet depressurization capacity and the cuttings cleaning capacity.According to the drilling parameters given,the optimal values of the drilling fluid flow rate,backward nozzle diameter,forward nozzle diameter,and throat diameter can be determined.Moreover,a case study is conducted to verify the effectiveness of the optimization method. 展开更多
关键词 Jet mill bit hydraulic depressurization model hydraulic cuttings cleaning model Parametric study hydraulic optimization
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Hydraulic model with roughness coefficient updating method based on Kalman filter for channel flood forecast 被引量:4
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作者 Hong-jun BAO Lin-na ZHAO 《Water Science and Engineering》 EI CAS 2011年第1期13-23,共11页
A real-time channel flood forecast model was developed to simulate channel flow in plain rivers based on the dynamic wave theory. Taking into consideration channel shape differences along the channel, a roughness upda... A real-time channel flood forecast model was developed to simulate channel flow in plain rivers based on the dynamic wave theory. Taking into consideration channel shape differences along the channel, a roughness updating technique was developed using the Kalman filter method to update Manning's roughness coefficient at each time step of the calculation processes. Channel shapes were simplified as rectangles, triangles, and parabolas, and the relationships between hydraulic radius and water depth were developed for plain rivers. Based on the relationship between the Froude number and the inertia terms of the momentum equation in the Saint-Venant equations, the relationship between Manning's roughness coefficient and water depth was obtained. Using the channel of the Huaihe River from Wangjiaba to Lutaizi stations as a case, to test the performance and rationality of the present flood routing model, the original hydraulic model was compared with the developed model. Results show that the stage hydrographs calculated by the developed flood routing model with the updated Manning's roughness coefficient have a good agreement with the observed stage hydrographs. This model performs better than the original hydraulic model. 展开更多
关键词 flood routing Manning's roughness coefficient updating method Kalman filter Froude number Saint-Venant equations hydraulic model
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HYDROLOGIC/HYDRAULIC MODELLING AND FLOOD RISK ANALYSIS FOR THE WEST TIAOXI CATCHMENT, TAIHU LAKE REGION, CHINA
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《Chinese Geographical Science》 SCIE CSCD 2000年第4期22-31,共10页
关键词 FLOOD MAP TAIHU LAKE REGION CHINA HYDROLOGIC/hydraulic modelLING AND FLOOD RISK ANALYSIS FOR THE WEST TIAOXI CATCHMENT
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HYDRAULIC MODEL OF A NEW BIPOLAR CELL FOR ALUMINUM PRODUCTION
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作者 Gao Zhaosheng Li Guoxun Shen Jianyun 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 1996年第1期16-20,共5页
The electrolyte circulations in monopolar cell and two-compartment bipolar cell with submerged electrodes were described by a hydraulic model.The influence of current density,electrode tilt,anode-cathode distance(ACD)... The electrolyte circulations in monopolar cell and two-compartment bipolar cell with submerged electrodes were described by a hydraulic model.The influence of current density,electrode tilt,anode-cathode distance(ACD)and immersion depth of electrodes on the electrolyte circulation velocities between electrodes had been studied.Results demonstrated that the flow rates in the two compartments of bipolar cell were very different,which provided important information for the structure design of bipolar cell. 展开更多
关键词 aluminum electrolysis hydraulic model bipolar cell
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1D-2D Hydraulic Modeling of a Diversion Channel on the Cavally River in Zouan-Hounien,Cote d’Ivoire
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作者 Kouassi Kouakou Lazare Brou Loukou Alexis +4 位作者 Yao Affoue Berthe Kouadio Zile Alex Konan Kouakou Seraphin Konan Koffi Felix Koffi Berenger 《Journal of Water Resource and Protection》 2019年第8期1036-1048,共13页
On the Cavally River, located on the border between C?te d’Ivoire and Liberia, several hydraulic structures such as bridges and diversion channels are planned to be made in recent years in the operating perimeter of ... On the Cavally River, located on the border between C?te d’Ivoire and Liberia, several hydraulic structures such as bridges and diversion channels are planned to be made in recent years in the operating perimeter of the Ity mining company. A 1D-2D hydraulic model was developed to design a diversion channel to cut a meander of the Cavally River in order to ensure hydraulic operation similar to the initial conditions of the river (water levels, flow and velocities). This model was designed with a flow rate of 240 m3/s and a Manning coefficient of 0.052 m1/3·s-1 for the minor bed and 0.06 m1/3·s-1 for the major bed. The results from the hydraulic model show that the hydraulic conditions (water levels, velocities) in the channel before and after the diversion remain almost like those of the Cavally River. 展开更多
关键词 hydraulic modeling Diversion Channel Cavally River Ity Cote d’Ivoire
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Thermal-hydraulic modeling and analysis of hydraulic system by pseudo-bond graph 被引量:2
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作者 胡均平 李科军 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第7期2578-2585,共8页
To increase the efficiency and reliability of the thermodynamics analysis of the hydraulic system, the method based on pseudo-bond graph is introduced. According to the working mechanism of hydraulic components, they ... To increase the efficiency and reliability of the thermodynamics analysis of the hydraulic system, the method based on pseudo-bond graph is introduced. According to the working mechanism of hydraulic components, they can be separated into two categories: capacitive components and resistive components. Then, the thermal-hydraulic pseudo-bond graphs of capacitive C element and resistance R element were developed, based on the conservation of mass and energy. Subsequently, the connection rule for the pseudo-bond graph elements and the method to construct the complete thermal-hydraulic system model were proposed. On the basis of heat transfer analysis of a typical hydraulic circuit containing a piston pump, the lumped parameter mathematical model of the system was given. The good agreement between the simulation results and experimental data demonstrates the validity of the modeling method. 展开更多
关键词 thermodynamics hydraulic system pseudo-bond graph piston pump modeling temperature simulation
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A THREE-SEGMENT HYDRAULIC MODEL FOR ANNULAR CUTTINGS TRANSPORT WITH FOAM IN HORIZONTAL DRILLING 被引量:7
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作者 CHENG Rong-chao WANG Rui-he 《Journal of Hydrodynamics》 SCIE EI CSCD 2008年第1期67-73,共7页
Through mechanical analysis, an improved hydraulic model for annular cuttings transport with foam was established for horizontal drilling. Based on the two critical inclination angles, the entire well was divided into... Through mechanical analysis, an improved hydraulic model for annular cuttings transport with foam was established for horizontal drilling. Based on the two critical inclination angles, the entire well was divided into three segments. The Bagnold stress, generalized power law rheological model and modified hindered particle settling velocity in foam fluid were adopted in the model to improve the simulation accuracy. The proposed model allows more precise prediction of cuttings transport property in the whole range of well inclination angle. Model performance was examined via case study and experimental data. Simulation results given by the propulsion iteration and trial-and-error method agree well with in-situ horizontal well drilling practice for the case study, and the comparison between the model prediction and Capo’s experimental data shows satisfactory agreement. 展开更多
关键词 horizontal well foam fluid drilled cuttings hydraulic model well inclination angle
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Integrating VGI and 2D hydraulic models into a data assimilation framework for real time flood forecasting and mapping 被引量:3
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作者 Antonio Annis Fernando Nardi 《Geo-Spatial Information Science》 SCIE CSCD 2019年第4期223-236,I0001,共15页
Crowdsourced data can effectively observe environmental and urban ecosystem processes.The use of data produced by untrained people into flood forecasting models may effectively allow Early Warning Systems(EWS)to bette... Crowdsourced data can effectively observe environmental and urban ecosystem processes.The use of data produced by untrained people into flood forecasting models may effectively allow Early Warning Systems(EWS)to better perform while support decision-making to reduce the fatalities and economic losses due to inundation hazard.In this work,we develop a Data Assimilation(DA)method integrating Volunteered Geographic Information(VGI)and a 2D hydraulic model and we test its performances.The proposed framework seeks to extend the capabilities and performances of standard DA works,based on the use of traditional in situ sensors,by assimilating VGI while managing and taking into account the uncertainties related to the quality,and the location and timing of the entire set of observational data.The November 2012 flood in the Italian Tiber River basin was selected as the case study.Results show improvements of the model in terms of uncertainty with a significant persistence of the model updating after the integration of the VGI,even in the case of use of few-selected observations gathered from social media.This will encourage further research in the use of VGI for EWS considering the exponential increase of quality and quantity of smartphone and social media user worldwide. 展开更多
关键词 Crowdsourced data VGI data assimilation(DA) flood forecasting 2D hydraulic modelling
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Hydraulic model for multi-sources reclaimed water pipe network based on EPANET and its applications in Beijing, China 被引量:1
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作者 Haifeng JIA Wei WEI Kunlun XIN 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2008年第1期57-62,共6页
Water shortage is one of the major water related problems for many cities in the world.The planning for utilization of reclaimed water has been or would be drafted in these cities.For using the reclaimed water soundly... Water shortage is one of the major water related problems for many cities in the world.The planning for utilization of reclaimed water has been or would be drafted in these cities.For using the reclaimed water soundly,Beijing planned to build a large scale reclaimed water pipe networks with multi-sources.In order to support the plan,the integrated hydraulic model of planning pipe network was developed based on EPANET supported by geographic information system(GIS).The complicated pipe network was divided into four weak conjunction subzones according to the distribution of reclaimed water plants and the elevation.It could provide a better solution for the problem of overhigh pressure in several regions of the network.Through the scenarios analy-sis in different subzones,some of the initial diameter of pipes in the network was adjusted.At last the pipe network planning scheme of reclaimed water was proposed.The proposed planning scheme could reach the balances between reclaimed water requirements and reclaimed water supplies,and provided a scientific basis for the reclaimed water utilization in Beijing.Now the scheme had been adopted by Beijing municipal government. 展开更多
关键词 hydraulic model multi-sources reclaimed water pipe network EPANET GIS BEIJING
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Hydraulics Management Model of Response Function Solved by Laplace Transform Boundary Element Method
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作者 尹尚先 孟召平 +1 位作者 刘月琴 王磊 《International Journal of Mining Science and Technology》 2000年第2期95-98,共4页
In solving a response function by the boundary element method, the use of the singular valued method and the Laplace transform in a time domain makes the solving process be simplified and the result be accurate. The r... In solving a response function by the boundary element method, the use of the singular valued method and the Laplace transform in a time domain makes the solving process be simplified and the result be accurate. The restricted condition matrix formed by the response matrix method is much smaller than that by embedding method. In addition, the response function may realize directly the management decision making. So it is efficient for establishing and solving hydraulics management models. 展开更多
关键词 BEM response matrix method hydraulics management model aplace transform singular points
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Using Hydraulic Engineering Model Experiment to Study the Sediment Trapping Efficiency of Adjustable Check Dam
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作者 Shu-Tzu Chen Hung-Ming Shu +1 位作者 Shin-En Chiu Chung-Li Hsu 《Engineering(科研)》 2016年第7期471-480,共11页
The construction of fully closed check dam (CD) is a conventional flood prevention mechanism implemented on rivers. Fully closed CDs trap large amounts of sediments in rivers to stabilize the river slopes and control ... The construction of fully closed check dam (CD) is a conventional flood prevention mechanism implemented on rivers. Fully closed CDs trap large amounts of sediments in rivers to stabilize the river slopes and control erosion. However, fully closed CDs cannot selectively trap sediment and may easily overflow, causing them to losing their ability to mediate and hold sediments. Previous studies proposed the concept of “breathable CDs”. The researcher introduced metal slit dam (SD) that could be assembled and disassembled quickly and conveniently. Once a CD reaches maximum capacity, operators must ensure that the water channels of the dam are free from blockage. Moreover, they must inspect the internal accumulation conditions of the dam periodically or immediately following heavy typhoon rains. When necessary, either the sediment buildup in the upriver blockage must be cleared, or the transverse structure of the dam must be removed to allow fine particles to be discharged along with a moderate amount of water. These actions can free up the sediment-storing capacity of the dam for the next heavy typhoon rains. In addition, operators should also inspect the damages inflicted on the dam, such as erosion, wear and tear, and deformation conditions. Damaged components should be disassembled and repaired if possible, or recycled and reused. The present study performed channel tests to simulate closed CDs, SDs, steel pipe dam (SPDs), and steel pipe plus slit dam (SPSDs) for 50-year and 100-year frequency floods. Results were then analyzed to determine the sediment trapping (ST) effects of various CDs, the effects of “adjustable CDs”, and the changes of moderated riverbeds. 展开更多
关键词 Sediment Trapping Check Dam Riverbed Change hydraulic Engineering model Experiment
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Fuzzy adaptive PID control on hydraulic servo system of quadruped robot 被引量:1
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作者 李杰 罗庆生 +1 位作者 王雷 常青 《Journal of Beijing Institute of Technology》 EI CAS 2013年第4期447-453,共7页
Quadruped robot driven by high power density hydraulic device works in unstructured en- vironment. With variable load and various external disturbance, the hydraulic servo system has fea- tures such as nonlinear, time... Quadruped robot driven by high power density hydraulic device works in unstructured en- vironment. With variable load and various external disturbance, the hydraulic servo system has fea- tures such as nonlinear, time-varying parameters. Traditional control method has some limitation. In order to help the hydraulic servo system of the quadruped robot to adapt to harsh environments, and to obtain high control quality and control precision, an incremental fuzzy adaptive PID controller based on position feedback is designed to solve the related technical problems. Matlab/Simulink sim- ulation and experimental results show that the incremental fuzzy adaptive PID controller improves the dynamic performance of the system, enhances the respond speed and precision of the hydraulic ser- vo system, and has some theory significance and practical value. 展开更多
关键词 quadruped robot hydraulic model fuzzy PID control adaptive control Matlab/Simu-link
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Modeling the effects of rainfall on vehicular traffic 被引量:1
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作者 Etikaf Hussain Syed Imran Ahmed Mir Shabbar Ali 《Journal of Modern Transportation》 2018年第2期133-146,共14页
Traffic management and drainage system are two vital issues for any metropolitan city. Like other big cities, Karachi is also facing problems due to lack of traffic management and poor drainage system. The main object... Traffic management and drainage system are two vital issues for any metropolitan city. Like other big cities, Karachi is also facing problems due to lack of traffic management and poor drainage system. The main objective of the study is to model the interdisciplinary issues of storm water and its effect on the traffic of Karachi. The specific objectives are (1) to calibrate and validate urban hydraulic and traffic micro-simulation models and (2) to model storm water and traffic for future conditions. This study is carried out on a 3-km section of arterial road. In this study, loose coupling of two models is done. For urban drainage, PCSWMM, and for traffic, VISSIM is used. Both models are calibrated for an existing situation on rainfall event of August 3, 2013, and then used for prediction of future scenario based on 50-year and 100-year return periods of rainfall. Sensitivity analysis of VISSIM is performed. Locations and lengths of road sections, where ponding happens for the future scenario, are identified using PCSWMM. These lengths axe then marked in VISSIM as low-speed areas, and delays are measured. Analysis of PCSWMM shows that for 100-year return period, there is maximum 0.318 ha-m (3180 cubic meters) water stored in the depressions of the road after 10 h of rainfall. Analysis of VISSIM shows that for a 100-year return period, there is a maximum delay of 35 min on NIPA to Hasan Square section of University Road. 展开更多
关键词 Traffic micro-simulation hydraulic modeling RAINFALL DELAYS PONDING
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Floodplain Mapping of Nashwaak River,Canada:An Assessment Based on High-Resolution Hydraulic Simulation 被引量:1
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作者 Saswati Deb Annie-Marie Laroche 《Journal of Shipping and Ocean Engineering》 2022年第1期1-11,共11页
Recent advances in hydraulic modeling create improved methodology to accurately predict the extent of floodplain map in order to assist policy makers to develop flood hazard mitigation measures and timely inform the l... Recent advances in hydraulic modeling create improved methodology to accurately predict the extent of floodplain map in order to assist policy makers to develop flood hazard mitigation measures and timely inform the local communities with the flood risk alerts.However,accurate prediction of the inundation map also depends on the spatial resolution of the topographic data.In this study,we developed a novel high-resolution modeling framework for Nashwaak River watershed,New Brunswick,Canada to capture significant flooding along the banks of the river for the two historic flood events and accurately map the floodplains for both the gauged and ungauged areas of the watershed.The model is based on HEC-RAS(US Army Corps of Engineers Hydrologic Engineering Center River Analysis System)hydraulic model and the topographic data were generated from high-resolution LiDAR data of~0.5 m.The model runs were driven by observed flow conditions applied at the boundary and the framework is based on different spatial resolution to determine the effect of spatial resolution on the predicted inundation.We validated the model simulated water surface elevation with the observed data and the model reproduces reasonably good skill score.Results from the numerical simulation suggest that apart from the strength of the stream velocity,design of the modeling framework plays an important role in determining the inundation depth as well as the maximum flooding extent. 展开更多
关键词 Floodplain map Nashwaak River hydraulic model INUNDATION HEC-RAS water surface elevation
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Influence of Swimming Pool Design on Hydraulic Behavior: A Numerical and Experimental Study
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作者 Anaelle Cloteaux Fabien Gerardin Noel Midoux 《Engineering(科研)》 2013年第5期511-524,共14页
A swimming pool can be considered as a chemical reactor with specific hydraulic and macro-mixing characteristics. The nature of flow into the pool depends on various characteristics, such as water inlets and outlets (... A swimming pool can be considered as a chemical reactor with specific hydraulic and macro-mixing characteristics. The nature of flow into the pool depends on various characteristics, such as water inlets and outlets (number and position), pool geometry, and flow rate. This study investigates how swimming pool design affects hydraulic behavior based on experimental and computational fluid dynamics studies (CFD). This paper does not describe the hydraulic behavior of all existing swimming pools, however the cases studied here are representative of pool designs widely used in Europe and the United States. The model developed, based on the principle of a stirred reactor, could be used as a first approach in describing the hydraulic behavior of regular pools. This model is suitable for the study of physical and chemical phenomena with long characteristic times. Other, more advanced, models were shown to be more suitable to the case of fast chemical processes. 展开更多
关键词 Computational Fluid Dynamics (CFD) hydraulic model Residence Time Distribution (RTD) Swimming Pool Velocity Field TRACER
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Modeling the effects of mechanical parameters on the hydrodynamic behavior of vertical current classifiers 被引量:3
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作者 Arabzadeh Jarkani Soroush Khoshdast Hamid +1 位作者 Shariat Elaheh Sam Abbas 《International Journal of Mining Science and Technology》 SCIE EI 2014年第1期123-127,共5页
This study modeled the effects of structural and dimensional manipulations on hydrodynamic behavior of a bench vertical current classifier. Computational fluid dynamics (CFD) approach was used as modeling method, an... This study modeled the effects of structural and dimensional manipulations on hydrodynamic behavior of a bench vertical current classifier. Computational fluid dynamics (CFD) approach was used as modeling method, and turbulent intensity and fluid velocity were applied as system responses to predict the over- flow cut size variations. These investigations showed that cut size would decrease by increasing diameter and height of the separation column and cone section depth, due to the decrease of turbulent intensity and fluid velocity. As the size of discharge gate increases, the overflow cut-size would decrease due to freely fluid stream out of the column. The overflow cut-size was significantly increased in downward fed classifier compared to that fed by upward fluid stream. In addition, reforming the shape of angular overflow outlet's weir into the curved form prevented stream inside returning and consequently unselec- tire cut-size decreasing. 展开更多
关键词 hydraulic classifier modeling Computational fluid dynamic Cut size
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Hydraulic metal structure health diagnosis based on data mining technology 被引量:3
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作者 Guang-ming Yang Xiao Feng Kun Yang 《Water Science and Engineering》 EI CAS CSCD 2015年第2期158-163,共6页
In conjunction with association rules for data mining, the connections between testing indices and strong and weak association rules were determined, and new derivative rules were obtained by further reasoning. Associ... In conjunction with association rules for data mining, the connections between testing indices and strong and weak association rules were determined, and new derivative rules were obtained by further reasoning. Association rules were used to analyze correlation and check consistency between indices. This study shows that the judgment obtained by weak association rules or non-association rules is more accurate and more credible than that obtained by strong association rules. When the testing grades of two indices in the weak association rules are inconsistent, the testing grades of indices are more likely to be erroneous, and the mistakes are often caused by human factors. Clustering data mining technology was used to analyze the reliability of a diagnosis, or to perform health diagnosis directly. Analysis showed that the clustering results are related to the indices selected, and that if the indices selected are more significant, the characteristics of clustering results are also more significant, and the analysis or diagnosis is more credible. The indices and diagnosis analysis function produced by this study provide a necessary theoretical foundation and new ideas for the development of hydraulic metal structure health diagnosis technology. 展开更多
关键词 hydraulic metal structure Health diagnosis Data mining technology Clustering model Association rule
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APPLICATION OF FRF ESTIMATOR BASED ON ERRORS-IN-VARIABLES MODEL IN MULTI-INPUT MULTI-OUTPUT VIBRATION CONTROL SYSTEM
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作者 GUAN Guangfeng CONG Dacheng HAN Junwei LI Hongren 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第4期101-105,共5页
The FRF estimator based on the errors-in-variables (EV) model of multi-input multi-output (MIMO) system is presented to reduce the bias error of FRF HI estimator. The FRF HI estimator is influenced by the noises i... The FRF estimator based on the errors-in-variables (EV) model of multi-input multi-output (MIMO) system is presented to reduce the bias error of FRF HI estimator. The FRF HI estimator is influenced by the noises in the inputs of the system and generates an under-estimation of the true FRF. The FRF estimator based on the EV model takes into account the errors in both the inputs and outputs of the system and would lead to more accurate FRF estimation. The FRF estimator based on the EV model is applied to the waveform replication on the 6-DOF (degree-of-freedom) hydraulic vibration table. The result shows that it is favorable to improve the control precision of the MIMO vibration control system. 展开更多
关键词 Multi-input multi-output(MIMO) system Errors-in-variables(EV) model 6-DOF hydraulic vibration table Waveform replication
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Implications of digital elevation models on habitat analysis of Golden Mahseer in the Upper Ganga Basin,India
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作者 J.P.Nale G.K.Pakhale 《Water Biology and Security》 2024年第4期44-54,共11页
Aquatic habitat analysis is crucial in determining the relationship between river flow and habitat availability for aquatic species.This helps in identifying the environmental flow requirements of rivers.However,condu... Aquatic habitat analysis is crucial in determining the relationship between river flow and habitat availability for aquatic species.This helps in identifying the environmental flow requirements of rivers.However,conducting habitat analysis in Indian rivers is challenging because of the unavailability of reliable and high-resolution terrain data.To address this challenge,a study was conducted to explore the possibilities of using Digital Elevation Models(DEMs)to extract required hydraulic data and to evaluate their accuracies.The extracted data were coupled with ecological data of a keystone fish species,namely Golden Mahseer(Tor putitora),to develop habitat analysis models for the Upper Ganga Basin(UGB)in India.The study adopted a hierarchical three-step approach for evaluating the accuracy and performance of DEMs as surrogate data sources.Firstly,cross sections at selected sites in the UGB were extracted from three different DEMs(SRTM,ASTER,and CARTOSAT)and evaluated against surveyed cross-section data with turning point tests and correlation coefficients.These data were then used to establish hydraulic and habitat analysis models.Four parameters(top width,flow cross-sectional area,hydraulic mean depth,and wetted perimeter)were evaluated using five error estimators to determine the accuracy and performance of hydraulic modelling.Finally,the hydraulic parameters were coupled with ecological requirements to develop a habitat model for different life stages of Golden Mahseer,namely fingerling,juvenile,and adult stages.We found that the SRTM predictions were better than those of the other DEMs,indicating its suitability to replicate channel geometry with higher accuracy,thus better predicting hydraulic parameters at all flow ranges.In habitat area estimation for adult Golden Mahseer,all the DEMs performed reasonably well(within±20%)within the flow range of 100 m3/s,which covers the low to average flow season.Beyond this flow range,ASTER and CARTOSAT resulted in considerable underestimations,averaging 22%and 54%,respectively.It is important to note that DEM-based cross sections lack high-resolution channel information,resulting in unstable habitat predictions for younger life stages like fingerling.However,overall,the study established that DEM-based data can be relied upon for habitat modelling-based assessment of environmental flows with some precautions for sensitive cases.Remote sensing presents a promising avenue for habitat analysis studies of Indian species,offering the potential to unlock significant progress in environmental flows(E-Flows)assessments and thus providing ecological benefits. 展开更多
关键词 DEM Environmental flows(E-flows) Golden mahseer Habitat modelling hydraulic modelling
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Development, assessment and implementation of integrated stormwater management plan: a case study in Shanghai 被引量:6
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作者 李田 张伟 黄俊杰 《Journal of Southeast University(English Edition)》 EI CAS 2014年第2期206-211,共6页
An innovative stormwater master plan based on low impact development LID is proposed.Unlike the traditional urban drainage plan this plan employs a sustainable stormwater management approach in communities utilizing L... An innovative stormwater master plan based on low impact development LID is proposed.Unlike the traditional urban drainage plan this plan employs a sustainable stormwater management approach in communities utilizing LID practices to reduce runoff and pollution load. An integrated hydraulic model which combines the traditional drainage sewer system with LID practices is adopted to assess the master plan.Through a long-term continuous simulation for 20 years the results reveal that the runoff volume will be reduced by over 80% following full implementation of this plan. Combining with the local conditions technical guidelines are established to provide assistance in implementing the stormwater master plan. Bioretention facilities for three main roads are constructed and other areas of development are being implemented sequentially under the guidance of the plan. This project provides an alternative method of stormwater management through the implementation of LID and it acts as a good example for other developing districts in China. 展开更多
关键词 stormwater master plan low impact development rainwater harvesting STORMWATER MANAGEMENT practices hydraulic model
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