期刊文献+
共找到22篇文章
< 1 2 >
每页显示 20 50 100
基于3S技术的长江中下游洪涝灾情评估研究 被引量:9
1
作者 詹小国 谭德宝 《人民长江》 北大核心 2000年第12期31-33,共3页
论述了利用GIS、RS和GPS评估长江中下游地区洪涝灾情的方法、模型和过程 ,灾情数据库特别是堤防数据库和历史灾害数据库建立的方法 ,提出了一个评估灾情损失相对大小、可用来进行洪涝灾情区划的指标———洪损度。即以某一基准年样区各... 论述了利用GIS、RS和GPS评估长江中下游地区洪涝灾情的方法、模型和过程 ,灾情数据库特别是堤防数据库和历史灾害数据库建立的方法 ,提出了一个评估灾情损失相对大小、可用来进行洪涝灾情区划的指标———洪损度。即以某一基准年样区各类灾情为基值 ,各地各年的各类损失值与它相比较后得出的比值乘以各自的权重 ,即得到每年的洪损度的大小。 展开更多
关键词 涝灾情 评估方法 3S技术 长江中下游
下载PDF
洪水灾害损失定量指标研究 被引量:5
2
作者 陈秀万 《科技通报》 1996年第1期40-42,共3页
本文提出定量表达洪水灾害总损失的指标──洪损度的概念,并对其具体涵义及计算方法做了详细阐述.
关键词 水灾害 损失程 定量指标
下载PDF
太湖流域洪水灾害损失及致因分析 被引量:1
3
作者 许吉 《山西建筑》 2009年第3期359-360,共2页
结合太湖流域1999年的洪水灾害,阐述了洪水灾害的损失分类,分析指出太湖流域1999年的洪灾为巨灾,指出太湖流域应制定超标准洪水的应急预案,以减少局部受淹城区的洪灾损失。
关键词 灾害
下载PDF
Estimate of CH_4 Emissions from Year-Round Flooded Rice Fields During Rice Growing Season in China 被引量:97
4
作者 CAIZu-Cong KANGGuo-Ding +1 位作者 H.TSURUTA A.MOSIER 《Pedosphere》 SCIE CAS CSCD 2005年第1期66-71,共6页
A special kind of rice field exists in China that is flooded year-round. These rice fields have substantially large CH4 emissions during the rice-growing season and emit CH4 continuously in the non-rice growing season... A special kind of rice field exists in China that is flooded year-round. These rice fields have substantially large CH4 emissions during the rice-growing season and emit CH4 continuously in the non-rice growing season. CH4 emission factors were used to estimate the CH4 emissions from year-round flooded rice fields during the rice-growing season in China. The CH4 emissions for the year-round flooded rice fields in China for the rice growing season over a total area of 2.66 Mha were estimated to be 2.44 Tg CH… 展开更多
关键词 IPCC methodology methane emission rice fields year-round flooded
下载PDF
Extreme Rainfall Events and Associated Natural Hazards in Alaknanda Valley, Indian Himalayan Region 被引量:4
5
作者 JOSHI Varun KUMAR Kireet 《Journal of Mountain Science》 SCIE CSCD 2006年第3期228-236,共9页
Entire Himalayan region is vulnerable to rain-induced (torrential rainfall) hazards in the form of flash flood, cloudburst or glacial lake outburst flood Flash floods and cloudburst are generally caused by high inte... Entire Himalayan region is vulnerable to rain-induced (torrential rainfall) hazards in the form of flash flood, cloudburst or glacial lake outburst flood Flash floods and cloudburst are generally caused by high intensity rainfall followed by debris flow or landslide often resulting into blockade of river channels. The examples of some major disasters caused by torrential rainfall events in last fifty years are the flash floods of 1968 in Teesta valley, in 1993 and 2000 in Sutlej valley, in 1978 in Bhagirathi and in 1970 in Alaknanda river valleys. The formation of landslide dams and subsequent breaching is also associated with such rainfall events. These dams may persist for years or may burst within a short span of its formation. Due to sudden surge of water level in the river valleys, havoc and panic are created in the down stream. In Maknanda valley, frequencies of such extreme rainfall events are found to be increasing in last two decades. However, the monthly trend of extreme rainfall events has partly indicated this increase. In most of the years extreme rainfall events and cloudburst disaster were reported in August during the later part of the monsoon season. 展开更多
关键词 Flash flood Cloudburst Extreme rainfall Alaknanda valley HIMALAYA INDIA
下载PDF
Suspended sediment transport analysis in two Italian instrumented catchments 被引量:2
6
作者 Adriana GARCIA-RAMA Stefano Giorgio PAGANO +1 位作者 Francesco GENTILE Mario Aristide LENZI 《Journal of Mountain Science》 SCIE CSCD 2016年第6期957-970,共14页
Suspended sediment transport in streams is an effective indicator of soil erosion at the watershed scale. This process was studied using the data obtained from two continuous monitoring stations installed in Italian w... Suspended sediment transport in streams is an effective indicator of soil erosion at the watershed scale. This process was studied using the data obtained from two continuous monitoring stations installed in Italian watersheds, the Rio Cordon and Torrente CarapeUe. The catchments have substantially different climatic, morphological and land use characteristics. The Rio Cordon, a small Alpine watershed, has been monitored since 1986, while in the Torrente Carapelle, a medium-size Mediterranean watershed, the monitoring station has provided data since 2007. Several flood events with suspended sediment transport were isolated in the two catchments, excluding those determined by snowmelt in the Rio Cordon as this process does not affect the Carapelle watershed. Analysis of the events showed different behavior in terms of hysteresis loop trends between water discharge (m3 S-1) and suspended sediment concentration (g 1-1) values, as the Rio Cordon confirms clockwise relationships most frequently, while counter-clockwise trends represent the majority of cases for the Carapelle Torrent. The different behavior of the two watersheds was further analyzed by evaluating relationships between the main hydrological parameters related to suspended sediment transport. Runoff controls the total sediment budget in both catchments. In contrast, it was noted that the runoff process does not interfere in the magnitude of the suspended sediment transport in the Rio Cordon catchment, while variations due to the larger size of the catchment area characterize the events in the Carapelle watershed. Lastly, a flow peak threshold that determines the advance or delay of the hydrograph peak with respect to the sedigraph peak was established for the Carapelle Torrent, while it was not reported in the Rio Cordon. 展开更多
关键词 Suspended sediment transport Continuous monitoring Hysteresis analysis Flowpeak threshold: Soil erosion
下载PDF
CHARACTERISTICS OF RAINFALL VARIATION OVER EAST CHINA FOR THE LAST 50 YEARS AND THEIR RELATIONSHIP WITH DROUGHTS AND FLOODS 被引量:10
7
作者 白爱娟 刘晓东 《Journal of Tropical Meteorology》 SCIE 2010年第3期255-262,共8页
With the precipitation data of 113 stations in East China during the last 50 years,the characteristics of the precipitation,including Precipitation Concentration Degree (PCD) and Precipitation Concentration Period (PC... With the precipitation data of 113 stations in East China during the last 50 years,the characteristics of the precipitation,including Precipitation Concentration Degree (PCD) and Precipitation Concentration Period (PCP) and their tendencies,are analyzed.The results show that the PCD in the northern part of the region is markedly higher than that in the southern part,but the PCP in the south is much earlier than that in the north by about one and a half months,which displays significant regional differences in precipitation.With the global warming,precipitation over East China shows an increasing tendency,but PCD displays a trend that is neither increasing nor decreasing.At the same time,the PCP is later than before,which can be mainly found in Jiangxi and southern Henan provinces.As a result,there are strong associations between the precipitation,PCD and PCP,which can be shown in the years with more precipitation,stronger PCD and later-than-usual PCP.In a word,the abnormal distribution of precipitation,PCP,and PCD over East China results in more extreme events of precipitation and more droughts and floods. 展开更多
关键词 droughts and floods precipitation concentration degree and period East China
下载PDF
Flooding Characteristics of Hydrofoil Impeller in a Two- and Three-phase Stirred Tank 被引量:2
8
作者 蔡清白 戴干策 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第3期355-361,共7页
The flooding characteristics of hydrofoil impeller were systematically investigated in a two-and three-phase 383 mm i.d. stirred tank operated on air, water and spherical glass beads. The volumetric solid concen-trati... The flooding characteristics of hydrofoil impeller were systematically investigated in a two-and three-phase 383 mm i.d. stirred tank operated on air, water and spherical glass beads. The volumetric solid concen-tration Cs was varied from 0 to 25%. And the superficial gas velocity Ug was at the range of 0-0.096 m·s-1. A fast and objective method for identifying flooding point NF is developed based on the statistical analysis of the pressure fluctuation signals. It is found, the effect of solid concentration on the flooding point NF depends on the gas velocity. At the lower gas velocity (Ug = 0.010 m·s-1), the solid concentration has only a minor effect. However, it displays a very significant effect on the flooding point NF at the medium and high gas velocity. The flooding point NF linearly increases with the gas velocity Ug, at lower solid concentration (Cs = 0, 10%). When Cs = 20%, the behavior of NF versus Ug becomes more complex. The correlations of the flooding characteristics in the slurry stirred tank are proposed by considering the solid concentration effect. 展开更多
关键词 flooding point NF flooding/loading transition hydrofoil impeller power spectra analysis
下载PDF
Influence of a Flood Event on Salinity and Nutrients in the Changshan Archipelago Area (Northern Yellow Sea)
9
作者 ZHANG Guangtao ZHAO Zengxia +2 位作者 LIU Changhua LIU Qun REN Jianming 《Journal of Ocean University of China》 SCIE CAS 2012年第3期419-426,共8页
River discharge can deliver nutrients to the coastal zone and change the hydrologic properties of the water column. Soon after a flash flood from the Yalu River (Northeast China) in August 2010, we investigated the sa... River discharge can deliver nutrients to the coastal zone and change the hydrologic properties of the water column. Soon after a flash flood from the Yalu River (Northeast China) in August 2010, we investigated the salinity and nutrient concentrations, as well as other environmental conditions in the Changshan Archipelago area, located approximately 100 km west of the river mouth in the northern Yellow Sea. Diluted water was mainly observed in the upper layers shallower than 15 m, with surface salinity between 18.13 and 30.44 in the eastern study area and between 28.16 and 29.72 in the western area. Surface salinity showed a significant negative correlation with concentrations of dissolved nutrients (P < 0.05), but not with that of Chlorophyll-a (Chl-a), dissolved oxygen (DO), particulate materials or pH. The average concentrations of nitrite, nitrate, and silicic acid decreased from the surface layer to bottom layer and were significantly higher in the east area than in the west area (P < 0.05). In contrast, average ammonium and phosphate concentrations were highest in the bottom layer of both areas, with no significant spatial differences. DO varied between 6.06 and 8.25 mg L-1 in the surface layer, and was significantly higher in the eastern area than in the western area in the surface and middle layers. Chl-a concentration was constantly below 4.09 μg L-1. Our work demonstrated the strong influences of Yalu River on proportions of various nutrient components in the Changshan Archipelago area. Silicic acid and total inorganic nitrogen levels were significantly elevated comparing to phosphate in the eastern area. Such changes can potentially induce phosphate limit to phytoplankton growth. 展开更多
关键词 Yalu River flash flood diluted water salinity nutrients Changshan Archipelago
下载PDF
Physical modelling and scale effects of air-water flows on stepped spillways 被引量:5
10
作者 CHANSON Hubert GONZALEZ Carlos A. 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第3期243-250,共8页
During the last three decades, the introduction of new construction materials (e.g. RCC (Roller Compacted Concrete), strengthened gabions) has increased the interest for stepped channels and spillways. However stepped... During the last three decades, the introduction of new construction materials (e.g. RCC (Roller Compacted Concrete), strengthened gabions) has increased the interest for stepped channels and spillways. However stepped chute hydraulics is not simple, because of different flow regimes and importantly because of very-strong interactions between entrained air and turbu- lence. In this study, new air-water flow measurements were conducted in two large-size stepped chute facilities with two step heights in each facility to study experimental distortion caused by scale effects and the soundness of result extrapolation to pro- totypes. Experimental data included distributions of air concentration, air-water flow velocity, bubble frequency, bubble chord length and air-water flow turbulence intensity. For a Froude similitude, the results implied that scale effects were observed in both facilities, although the geometric scaling ratio was only Lr=2 in each case. The selection of the criterion for scale effects is a critical issue. For example, major differences (i.e. scale effects) were observed in terms of bubble chord sizes and turbulence levels al- though little scale effects were seen in terms of void fraction and velocity distributions. Overall the findings emphasize that physical modelling of stepped chutes based upon a Froude similitude is more sensitive to scale effects than classical smooth-invert chute studies, and this is consistent with basic dimensional analysis developed herein. 展开更多
关键词 Physical modelling Scale effects Stepped spillways Air entrainment Air-water flow measurements
下载PDF
Effects of Erosion Control Measures on Mountain Floods: A Case Study of the Censhui River South Branch Watershed
11
作者 Changzhi Li Hong Wang +2 位作者 Baozhao Yuan Dongya Sun Changjun Liu 《Journal of Agricultural Science and Technology(A)》 2015年第8期646-654,共9页
To investigate the effects of various erosion control measures on mountain floods, a case study was conducted in Censhui River South Branch Watershed using scenario analysis and soil conservation service (SCS) metho... To investigate the effects of various erosion control measures on mountain floods, a case study was conducted in Censhui River South Branch Watershed using scenario analysis and soil conservation service (SCS) methods. A distributed hydrological model was developed, and watershed parameters were determined based on satellite imagery, digital terrain models, digital maps and field investigations. Two types of erosion control measures were investigated: the variation of vegetation covers and the change of cultivation techniques. Seven scenarios were considered for the test watershed. The results show: (1) while the de-vegetation results in the increase of peak discharge, the improve of vegetation covers decreases peak discharge at watershed scale; (2) by both improving vegetation cover and enhancing terrace-cultivation technology, the peak discharge is reduced and the peak flow arrival time is delayed; (3) attention should be attached to both early warning system and measures changing the underlying surface and conveyance systems. 展开更多
关键词 WATERSHED soil and water conservation mountain flood erosion control measures scenario analysis.
下载PDF
Typhoon-dominated Influence on Wood Debris Distribution and Transportation in a High Gradient Headwater Catchment
12
作者 CHEN Su-Chin CHAO Yi-Chiung CHAN Hsun-Chuan 《Journal of Mountain Science》 SCIE CSCD 2013年第4期509-521,共13页
Wood debris is an important component of mountain streams. It causes serious damage and renders difficulty of water resource management in Taiwan. In this study, the quantity of wood debris and variation of migratory ... Wood debris is an important component of mountain streams. It causes serious damage and renders difficulty of water resource management in Taiwan. In this study, the quantity of wood debris and variation of migratory wood debris during flood events were examined. The downstream of Gaoshan Creek and Qijiawan Creek, located at Central Taiwan, was selected as the study area. The distribution and dynamic of wood debris in a high gradient headwater catchment were quantified using field surveys. A formula of critical depth for wood debris entrainment was used to evaluate the wood debris migration during three flooding events. In the study area, wood abundance and unit volume increased downstream, and wood density decreased downstream within a channel network. The channel morphology, riparian vegetation, and wood debris characteristics were found to influence the wood storage. As a result, the wood debris has an irregular accumulative distribution in the steep stream, and it migrates easily in the stream because of a high flow discharge. Strong relationships between the channel width and wood debris variables are discovered. Moreover, wood debris has a tendency to accumulate at sites with low stream power and wood debris dams, topographical notches, and unique geological structures. Our findings assist in the understanding of the effects of channel characteristics on distributions of wood debris in steep stream systems. 展开更多
关键词 Wood debris Spatial distribution
下载PDF
Dam-break Flood Simulation under Various Likely Scenarios and Mapping Using GIS:Case of a Proposed Dam on River Yamuna,India 被引量:6
13
作者 Mahendra S.LODHI Devendra K.AGRAWAL 《Journal of Mountain Science》 SCIE CSCD 2012年第2期214-220,共7页
The precision modeling of dam break floods can lead to formulation of proper emergency action plan to minimize flood impacts within the economic lifetime of the assets.Application of GIS techniques in integration with... The precision modeling of dam break floods can lead to formulation of proper emergency action plan to minimize flood impacts within the economic lifetime of the assets.Application of GIS techniques in integration with hydrological modeling for mapping of the flood inundated areas can play a momentous role in further minimizing the risk and likely damages.In the present study,dam break analysis using DAMBRK model was performed under various likely scenarios.Probable Maximum Flood (PMF)calculated for a return period of 1000 years using deterministic approach was adopted for dam break analysis of the proposed dam under various combinations of breach dimensions.The available downstream river cross-sections data sets were used as input in the model to generate the downstream flood profile.Dam break flow depths generated by the DAMBRK model under various combinations of structural failure are subsequently plotted on Digital Elevation Model(DEM)of the downstream of dam site to map the likely affected area.The simulation results reveals that in one particular case the flood without dam may be more intense if a rainfall of significant intensity takes place. 展开更多
关键词 Dam break analysis DAMBRK GIS Flood mapping HYDROPOWER INDIA
下载PDF
A catastrophic debris flow in the Wenchuan Earthquake area,July 2013:characteristics,formation,and risk reduction 被引量:2
14
作者 HU Tao HUANG Run-qiu 《Journal of Mountain Science》 SCIE CSCD 2017年第1期15-30,共16页
In the Wenchuan Earthquake area,many co-seismic landslides formed blocking-dams in debris flow channels. This blocking and bursting of landslide dams amplifies the debris flow scale and results in severe catastrophes.... In the Wenchuan Earthquake area,many co-seismic landslides formed blocking-dams in debris flow channels. This blocking and bursting of landslide dams amplifies the debris flow scale and results in severe catastrophes. The catastrophic debris flow that occurred in Qipan gully(Wenchuan,Southwest China) on July 11,2013 was caused by intense rainfall and upstream cascading bursting of landslide dams. To gain an understanding of the processes of dam bursting and subsequent debris flow scale amplification effect,we attempted to estimate the bursting debris flow peak discharges along the main gully and analyzed the scale amplification process. The results showed that the antecedent and triggering rainfalls for 11 July debris flow event were 88.0 mm and 21.6 mm,respectively. The event highlights the fact that lower rainfall intensity can trigger debris flows after the earthquake. Calculations of the debris flow peak discharge showed that the peak discharges after the dams-bursting were 1.17–1.69 times greater than the upstream peak discharge. The peak discharge at the gully outlet reached 2553 m^3/s which was amplified by 4.76 times in comparison with the initial peak discharge in the upstream. To mitigate debris flow disasters,a new drainage channel with a trapezoidal V-shaped cross section was proposed. The characteristic lengths(h1 and h2) under optimal hydraulic conditions were calculated as 4.50 m and 0.90 m,respectively. 展开更多
关键词 Disaster characteristics Formation mechanisms Risk reduction Debris flow Wenchuan Earthquake Blocking dam
下载PDF
Measuring internal residual stress in Al-Cu alloy forgings by crack compliance method with optimized parameters 被引量:6
15
作者 DONG Fei YI You-ping HUANG Shi-quan 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3163-3174,共12页
Measuring the internal stress of Al alloy forgings accurately is critical for controlling the deformation during the subsequent machine process.In this work,the crack compliance method was used to calculate the intern... Measuring the internal stress of Al alloy forgings accurately is critical for controlling the deformation during the subsequent machine process.In this work,the crack compliance method was used to calculate the internal residual stress of Al-Cu high strength alloys,and the effect of various model parameters of crack compliance method on the calculated precision was studied by combining the numerical simulation and experimental method.The results show that the precision first increased and then decreased with increasing the crack range.The decreased precision when using a high crack range was due to the strain fluctuation during the machining process,and the optimized crack range was 71%of the thickness of forgings.Low orders of Legendre polynomial can result in residual stress curve more smooth,while high orders led to the occurrence of distortion.The Tikhonov regularization method effectively suppressed the distortion of residual stress caused by the fluctuation of strain data,which significantly improved the precision.In addition,The crack compliance method with optimized parameters was used to measure the residual stress of Al-Cu alloy with different quenching methods.The calculated results demonstrated that the distribution of residual stress was obtained accurately. 展开更多
关键词 residual stress crack compliance method crack range interpolation orders Tikhonov regularization method
下载PDF
The flood control and regulation of Three Gorges Project
16
作者 Cai Qihua 《Engineering Sciences》 EI 2011年第3期15-21,共7页
The important role of Three Gorges Project (TGP) in the flood management of the Yangtze River Basin is summarized.The Optimal Regulation Schemes of the Three Gorge Reservoir is briefly described.The flood regulation e... The important role of Three Gorges Project (TGP) in the flood management of the Yangtze River Basin is summarized.The Optimal Regulation Schemes of the Three Gorge Reservoir is briefly described.The flood regulation effect of TGP is analyzed.Typical issues related to reservoir operation for flood regulation are discussed and suggestions are put forward for the future work. 展开更多
关键词 Three Gorges Project flood control REGULATION
下载PDF
Extreme Weather Related Disasters: A Case Study of Two Flashfloods Hit Areas of Badrinath and Kedarnath Valleys, Uttarakhand Himalaya, India
17
作者 Vishwambhar Prasad Sati 《Journal of Earth Science and Engineering》 2013年第8期562-568,共7页
Climate induced disasters such as cloudburst triggered flash floods, debris-flow, mass movements and landslides are very common phenomenon in the Himalaya. There are many instances in the recent past when these catast... Climate induced disasters such as cloudburst triggered flash floods, debris-flow, mass movements and landslides are very common phenomenon in the Himalaya. There are many instances in the recent past when these catastrophes caused heavy losses to lives and tremendous damage to property. One of the important characteristics of the Himalaya during the monsoon season is heavy downpour (cloudburst) which is due to extreme weather condition. Further, the landscape is very fragile and the human settlements are located either along the perennial streams of big rivers or on the unstable slopes. These perennial streams and big rivers are highly violent during the monsoon and whenever, the water level of these streams rises, it causes heavy loss to property and lives through destruction of the human settlements located along these courses. During the recent past, extreme changes in the climatic conditions have been seen largely due to the anthropogenic activities, i.e., population growth and large-scale deforestation. It has not only affected the climatic conditions but also affected the daily life of the inhabitants. This article examines the extreme weather related disasters in the Himalaya and gives a description of two deadly cloudburst triggered flashfloods that occurred in the Kedarnath and Badrinath valleys, which left the entire landscape devastated. This was followed by devastation of the settlements, agricultural fields, and thousands of lives were wiped out during this catastrophe. Rainfall data were collected to know about the changes in the climatic conditions and their impacts on the disaster in this part of the Himalaya. 展开更多
关键词 Climate disaster cloudburst SETTLEMENT DEFORESTATION Himalaya.
下载PDF
Flood Vulnerability Assessment: A Multiscale, Multitemporal and Multidisciplinary Approach 被引量:1
18
作者 Edna M. Rodriguez-Gaviria Veronica Botero-Fernadez 《Journal of Earth Science and Engineering》 2013年第2期102-108,共7页
Recent catastrophic events related to floods in Colombia reveal again the situation of disaster as a development issue not solved in the country. It is necessary to analyze in more detail the areas under threat and th... Recent catastrophic events related to floods in Colombia reveal again the situation of disaster as a development issue not solved in the country. It is necessary to analyze in more detail the areas under threat and their respective vulnerability to the different mechanisms can generate flooding events and make adjustments in the assessment of disaster risks for the appropriate decision-making at local, regional and national levels. This paper presents a research project in its first phase, whose main objective is to develop a methodology for vulnerability assessment from a multiscale, multitemporal and multidisciplinary perspectives, combining the use of indicators and a spatial information system to analyze exposure and vulnerability at regional and local level in specific areas. This methodological tool will also enable local and regional authorities to identify the most appropriate strategies to reduce vulnerability and adaptation options, and make better decisions in assessing disaster risk. The information generated in this study will contribute to public policy action structured to correct short- and medium-term situations of actual or potential vulnerability, which can also be used in other activities of territorial and environmental planning, developing technology transfer activities and training associated with the research project in the service of the authorities and communities. Results obtained of the vulnerability analysis for a Colombian study area will relate to the hazards obtained in a parallel project whose goal is to identify the best risk management strategies through the development of GIS (geographic information system)-based scenarios for different risk and vulnerability reduction options. 展开更多
关键词 Floods hazards developing countries GIS DISASTER indicators.
下载PDF
Some Reflections of the Geographies of Socio-Economic Impact of the Kosi River Floods, 2008
19
作者 Rituparna Bhattacharyya Muraree Lal Meena Suman Singh 《Journal of Earth Science and Engineering》 2013年第1期57-65,共9页
In India, floods remain a natural recurrent event of many major rivers of the sub-continent. Most frequently, it occurs during the "monsoon season" when precipitation remains very heavy and the natural watercourses ... In India, floods remain a natural recurrent event of many major rivers of the sub-continent. Most frequently, it occurs during the "monsoon season" when precipitation remains very heavy and the natural watercourses fail to accommodate excess water. The river Kosi, located in Bihar, India too bears a long history of annual floods and is often labeled as a "Sorrow of Bihar" due to its strange behavioural attributes and the extensive damage it causes as a result of severe flood inundation. The river Kosi is one of the megafans of the Gangetic plains. Geologic evidence demonstrates that the megafans are prone to devastating flood hazards. On August 18, 2008, the river Kosi burst through its banks to flow into a channel it had abandoned more than 200 years ago, drowning towns, numerous villages and rendering over a million homeless and many were reported to have died. The research is an attempt to reflect on the geographies of socio-economic impact of the Kosi flood, 2008. For this, the research uses a holistic approach. The findings suggest that the rescue and rehabilitation operation continue in the post flood region. However, operations were significantly delayed as the result of inept bureaucratic process and insufficient funding. The final sections draw together, the threads of analysis and suggest suitable measures, so that the floods of such magnitude can be managed better in near future. 展开更多
关键词 FLOOD river Kosi geographies of socio-economic impact holistic approach management.
下载PDF
龙溪嘉陵江特大桥钢围堰施工关键技术 被引量:5
20
作者 高向宇 周锋 +3 位作者 陈传勇 梁凯 王光辉 罗华 《公路交通科技(应用技术版)》 CAS CSCD 北大核心 2020年第11期221-224,共4页
龙溪嘉陵江特大桥主桥为(108+200+108)m预应力混凝土连续刚构桥。该桥8#、9#墩为主墩,其中,8#主墩桩基采用19根直径2.8m、长度35m的钻孔灌注桩基础。承台采用双壁钢套箱钢围堰(尺寸为47.8m×17.8m,高25m)施工。钢围堰竖向分为4节,... 龙溪嘉陵江特大桥主桥为(108+200+108)m预应力混凝土连续刚构桥。该桥8#、9#墩为主墩,其中,8#主墩桩基采用19根直径2.8m、长度35m的钻孔灌注桩基础。承台采用双壁钢套箱钢围堰(尺寸为47.8m×17.8m,高25m)施工。钢围堰竖向分为4节,自下向上分块高为7.5m+6m+6m+5.5m,每节侧板平面分8块。底节钢围堰采用原位拼装,并利用2800t提升下放系统将围堰下沉到位;钢围堰吸泥下沉到设计标高后,采用垂直导管"减球法"进行封底施工,并利用现场边角料在钢围堰内侧焊接加强角钢,以提高封底混凝土握裹力;围堰下放到设计标高后,安装度洪装置系统,保证围堰的整体稳定性。8#主墩钢围堰封底后,检查未发现漏水现象,施工质量达到设计要求。 展开更多
关键词 双壁钢套箱钢围堰 吸泥下沉 封底 度洪 施工技术
原文传递
上一页 1 2 下一页 到第
使用帮助 返回顶部