Sensitivity Analysis of Thermal Equilibrium Parameters of MIKE 11 Model:A Case Study of Wuxikou Reservoir in Jiangxi Province of China

Sensitivity analysis of thermal equilibrium parameters in the reservoir module of MIKE 11 model was conducted for the Wuxikou Reservoir in Jiangxi Province of China in order to apply the module to the environmental impact assessment to accurately predict water temperature of reservoirs.Results showed that radiation parameter A and evaporation-first parameter were much more sensitive than other parameters.The values of the radiation parameter A ranged from 0.10 to 0.34.The values of evaporation-first parameter varied from 0 to 10.The sensitivity of solar absorption parameters was less than that of evaporation parameter,of which light attenuation values ranged from 0.5 to 0.7,and this parameter would not impact model results if it was more than 2.Constants in Beer's law ranged from 0.2 to 0.7.Radiation parameter B was not more sensitive than evaporation parameter and its reasonable range was higher than 0.48.The fitting curves showed consistent changing tendency for these parameters within the reasonable ranges.Additionally,all the thermal equilibrium parameters had much more important effects on surface water temperature than deep water temperature.Moreover,if no observed data could be obtained,the local empirical value would be used to input to the MIKE 11 model to simulate the changes in the discharged outflow-water temperature qualitatively.

基于MIKE 11的秦淮河流域控制断面水质达标模拟

选取外秦淮河控制断面作为研究对象,构建秦淮河一维水环境数学模型(MIKE 11),模拟不同水文气象条件下多种引水工况和污染削减方案对水质改善的影响。结果表明:当上游来水为Ⅲ类水时,汛期污染量削减≥50%,非汛期污染量削减≥50%或秦淮新河调水量≥15 m^(3)/s可保证断面水质达标;在90%降雨保证率情景下,区域污染量削减≥50%或秦淮新河引水≥30 m^(3)/s,以及引水量≥15 m3/s和污染量削减≥25%的组合方案可保证断面水质达标。当上游来水维持现状时,非汛期需要增加区域污染削减率或秦淮新河引水量来保证断面水质达标。

Verification of the MIKE11-NAM Model for Simulating Streamflow

Modeling watershed hydrological processes are important for water resources planning, development, and management. In this study, the MIKE 11-NAM (Nedbor-Afstromings Model model) was evaluated for simulation of streamflow from the Bina basin located in the Madhya Pradesh State of India. The model was calibrated and validated on a daily basis using five years (1994-1998) observed hydrological data. In addition, a model sensitivity analysis was performed on nine MIKE 11-NAM parameters to identify sensitive model parameters. Statistical and graphical approaches were used to assess the performance of the model in simulating the streamflow of the basin. Results show that during daily model calibration, the model performed very well with a coefficient of determination (R2) and the percentage of water balance error (WBL) values 0.87% and -8.63%, respectively. In addition, the model performed good during the validation period with R2 and WBL values of 0.68% and -6.72%, respectively. Model sensitivity analysis results showed that Overland flow runoff coefficient (CQOF), Time constant for routing overland flow (CK1,2) and Maximum water content in root zone storage (Lmax) were found as the most influential and sensitive model parameters for simulating streamflow. Overall, the model’s performance was satisfactory based on R2 and EI metrics.

MIKE 11/NAM模型在挠力河流域的应用

在水文水资源的管理实践中,气候变化以及农业开发等活动对流域水资源的影响往往无法通过数据直观体现,水文模型常被用于提供水资源管理决策所必须的一些重要信息。集总式概念模型结构简单,仅依赖有限的数据和较少的参数即可对流域主要水文过程进行有效的模拟。本研究将MIKE 11水动力模型和降雨径流模型(NAM)耦合,应用到三江平原挠力河流域。结果表明,MIKE 11/NAM模型可以对挠力河流域降雨径流过程进行较好的模拟,模型在率定期的表现优于验证期。造成模型在验证期模拟效果降低的最主要原因可能是强烈的农业开发活动对流域下垫面性质的改变。20世纪50年代以来三江平原地区高强度的农业开发活动深刻影响了流域水文情势,并且这种影响在近20年仍然持续。本研究所构建模型的不确定性主要来源于输入数据的时空精度、模型结构和最优参数集的选择。

基于MIKE11模型的平原感潮河网城市防洪规划研究

平原感潮河网城市人口众多,经济发达,河道湖泊密布。随着近年来城市化的快速发展,城市防洪压力与日俱增。以海门市为研究对象,运用MIKE11模型对研究区域内河网及水工建筑物进行概化,在100年一遇降雨与潮位组合情况下,模拟计算现状和规划工况条件下区域内主干河道的最高水位,对比防洪规划实施前后研究区域内主要河道的水位变化情况,分析防洪规划带来的有利影响。计算结果表明在平原感潮河网城市的防洪规划中,MIKE11模型具有一定的应用价值。在改、扩、新建主干河道和沿江闸站等工程措施下,区域排水能力加大,并阻止长江高潮位的顶托倒灌,河道100年一遇设计水位明显降低。

MIKE 11模型在望虞河西控工程排涝计算中的应用

针对武澄锡虞区遭遇五年一遇暴雨情况,采用适合于平原河网及城市区域产汇流模拟的水文水力模型--MIKE 11模型,将其中的NAM模型和HD模块进行耦合,根据望虞河西控工程调度方案,由设计暴雨推求评价区河道涝水特征值。通过排涝水文计算,模拟对比望虞河西岸封闭前后,评价区遭遇五年一遇暴雨时,河网节点的水位、流量过程,分析望虞河西岸封闭对评价区水系、洪水位、高水位持续时间及半高地淹没状况的影响。模型计算结果表明,望虞河西控工程实施后,望虞河西岸地区最高水位普遍抬升,受影响区域内高水位持续时间增长,对部分半高地存在潜在淹没影响。

基于MIKE11的航电枢纽建设工程水质模拟

为分析沱江干流自贡段航电枢纽建设前后对河道水质的影响,针对沱江干流污染现状,以沱江干流主要污染物COD、氨氮、TP为指标,应用MIKE 11模型建立能客观反映模拟河段水动力、水质时空演变规律的模型,分析了银蛇溪枢纽建库前后对沱江干流水质的影响。模拟结果表明:在污染负荷不增加的情况下,李家湾、黄葛浩、银蛇溪断面在建库后枯水年枯水月COD预测浓度月均值有所超标;枯水年NH3-N预测浓度较建库前增加率最高,平水年次之,丰水年最低;枢纽建设后,各断面TP浓度进一步升高。本研究以沱江自贡段航道建设工程为例,分析不同典型年下航电枢纽建设前后水质情况,研究结果可为沱江干流航电枢纽建设项目水质影响预测提供科学依据。

MIKE11模型在台州市区河网纳污能力计算中的应用

应用MIKE11模型模拟台州市区河道水质,计算了河道水环境容量,并以流域污染物总量控制为核心,根据收集的水文和水质数据构建台州市区河道COD与NH3-N的负荷历时曲线,计算最大日负荷与多年平均允许负荷,并在污染源之间、不同水文年进行污染负荷分配.建议今要收集更多的实测样本资料,并在构建负荷历时曲线模型时单独处理河岸污染源涉及范围.

河道海绵建设中SWMM-MIKE 11耦合模型的构建及应用思路

为解决我国城市化进程中的水安全和水环境问题,结合海绵城市建设理念和河道综合整治目标,分析暴雨洪水管理模型(storm water management model,SWMM)和MIKE 11模型的适用范围、具备优势和存在不足。结果表明,SWMM广泛应用于径流总量控制和面源污染削减的模拟,但是无法模拟河道中污染物的对流扩散和生化过程;MIKE 11河网模型广泛应用于城市河道水量和水质模拟,可预测特定条件下的河道水环境变化情况,但是无法反映陆域面源污染对河道水质的冲击影响。构建SWMM-MIKE 11耦合模型,利用SWMM进行海绵设施和雨水管网模拟,将SWMM中管网排口径流作为边界条件导入到MIKE 11模型中,可以实现二者优势互补。

基于MIKE 11与HEC-RAS的南渡江防洪能力对比分析

利用实测地形和水文资料,基于一维河网模型系统MIKE 11与HEC-RAS分别建立了南渡江下游河段1维水动力模型。着重以HEC-RAS和MIKE 11对河道糙率的不同计算方法为出发点,利用南渡江实测地形和水文资料进行计算,然后对计算结果进行比较分析,得到2种软件的联系与区别。模型率定和验证结果表明,所建2种模型均能够反映河网水动力条件,但是MIKE 11模拟结果更接近实测值。同时,以南渡江20年一遇洪水为例,模拟了现状河道在修建堤防以后的防洪水位,并对2种模型结果对比分析,为南渡江防洪及河堤规划提供依据。

虾稻共作产汇流过程中TANK-MIKE 11耦合模型的应用

以构建的适合于平原灌区虾稻共作田降雨-径流过程模拟的TANK-MIKE 11耦合模型为工具,对四湖流域典型虾稻共作田区进行区域排涝影响研究。模拟了在不同降雨标准下,虾稻田种植面积占比、虾稻田上限排水深等条件变化对四新垸农排区径流的影响,结果表明:在不同历时暴雨重现期下,相较于50%现有虾稻共作种植面积,当虾稻田面积为10%与90%时,外排水量分别增加6%~28%和减少3%~18%;在各种设计暴雨下,相较于1.2 m虾沟上限排水深,1.3m时洪峰流量减小3.01%~5.62%。1.4 m时洪峰流量减小5.79%~10.36%。

基于MIKE 11模型的鹅头分汊型河道水面线及分流比计算

分汊型河道是冲积平原河流中常见的一种河型,研究分汊型河道的水面线及分流比对于在分汊型河道上设计涉水工程具有重要的意义。本文以汉江襄阳鱼梁洲河段为例,根据2015年实测固定断面和2011、2017年实测洪水调查资料,采用MIKE 11一维水动力模型对鹅头分汊型河道的水面线及分流比进行了研究,结果表明:各级不同来水条件下,汉江鱼梁洲左、右汊分流比较稳定,总体变化不大;随着干流总来水流量增大,汉江左汊的分流比随之增加。

基于MIKE 11水动力模块的水闸规模论证研究

鉴于河网区水文水动力条件复杂的情况,为精确模拟洪涝过程,确定排涝工程规模。以宁波市大嵩江流域为例,建立基于MIKE11水动力模块的排涝区河网模型,按照流域情况、地形、水系结构及水流走向、工程布局、控规路网等影响因素概化模型,对排涝过程进行数值模拟,比对分析重建的龙尾碶水闸规模参数。计算确定水闸规模为净宽9 m(3孔×3 m),可降低平原区内水位0.2 m~0.3 m,工程的实施可改善区域防洪排涝能力。MIKE11计算模型可为优化区域排涝工程方案提供更为精确的设计依据。

MIKE11水质模型在流域水环境中的应用综述

MIKE 11水质模型是应用于水体进行情景模拟预测的数学模型,是研究水体环境的重要工具。本文简要介绍了MIKE 11水质模型,总结MIKE 11模型在流域水环境的污染治理、感潮河网治理、水环境容量计算、流域安全预警等方面的应用。

基于SWMM和MIKE11的城市河流水质动态模型构建及应用

为了对城市河流水污染治理提出精细化控制建议,科学合理地制定流域水环境综合治理措施,以茅洲河为研究对象,基于Visual Studio开发SWMM与MIKE11的耦合程序,采用映射配置文件将两个模型的空间拓扑关联,构建了城市河流水质动态模型,并在模型率定验证的基础上将其应用于流域水质情势预测。结果表明:城市河流水文-水动力-水质耦合模型具有较好的模拟能力和适应性,可用于类似流域水质动态模拟、预测及评估。

基于Mike模型珲春河洪水演进数值模拟

本文以吉林省中小河流珲春河洪水风险图编制为研究对象,采用MIKE 11和Mike21模型耦合对河道和淹没区进行了洪水演进数值模拟。通过对历史洪水的模拟率定并验证了模型中重要的糙率参数,并应用于东关村溃口洪水演进分析计算,成果可为风险评估、避险转移提供重要依据。

Water Quality Model Establishment for Middle and Lower Reaches of Hanshui River,China

With the development of industry and agriculture,nitrogen,phosphorus and other nutrients in the Hanshui River greatly increase and eutrophication has become an important threat to the water quality of the Hanshui River,especially in the middle and lower reaches.The primary objective of this study was to establish the water quality model for the middle and lower reaches of the Hanshui River based on the model of MIKE 11.The main pollutants migration and transformation process could be simulated using the water quality model.The rainfall-runoff model,hy-drodynamic model and water quality model were established using MIKE 11.The pollutants,such as chemical oxygen demand(COD),biochemical oxygen demand(BOD),ammonia nitrogen,nitrate nitrogen,phosphorus,dissolved oxy-gen(DO),were simulated and predicted using the above three models.A set of methods computing non-point source pollution load of the Hanshui River Basin was proposed in this study.The simulated and observed values of COD,BOD5,ammonia,nitrate,DO,and total phosphorus were compared after the parameter calibration of the water quality model.The simulated and observed results match better,thus the model can be used to predict water quality in the fu-ture for the Hanshui River.The pollution trend could be predicted using the water quality model according pollution load generation.It is helpful for government to take effective measures to prevent the water bloom and protect water quality in the river.

基于MIKE的南宁市南湖环水系水质水量耦合模型的研究

论述了基于MIKE11/21和Ecolab模型建立的邕江、南湖和竹排江水系的水质水量耦合模型,分析南湖环水系水质变化特征,研究不同的外江引水方式和截污减污程度下,该区域总氮、总磷和氨氮水质变化趋势及水质改善的效果。结果表明,凤岭截污和竹排江生活污水的处理应是未来南湖环水系治理的重点。

An Integrated Hydrological Model for Water Balance Estimation in the Chirchik River Basin, Northern Uzbekistan

Accurate and detailed information of hydrological balance, and its dynamic nature is needed to develop strategies for sustainable use and management of water resources. In this concern, a fully integrated MIKE SHE model was developed to study the hydrological balance of the Chirchik River Basin, Uzbekistan. Parameters in the model were calibrated and simulated results were validated for the periods 2009-2011 and 2012-2013 in term of two observed hydrological parameters: streamflow rate and groundwater table. After the successful calibration of the parameters, the model produced quantitative results of the water cycle and provided better understanding of the surface and groundwater interactions. The results show that the hydrological balance is strongly dependent on the intensity of agricultural activity within the basin. An actual evapotranspiration was found as a main water loss element among the water transport components due to large-scale agricultural irrigation activities. This corresponds to 77% of the total water budget as an average. A satisfactory water balance simulation error was obtained after adjusting model parameters to basin environment.

平原圩区复合下垫面水文水动力耦合模型

平原圩区地势低洼,下垫面类型多样,产汇流过程较为复杂,水文过程模拟和预报十分困难。为解决平原圩区洪水预报难题,建立考虑水田、旱地、林地、城市区与水域等多种下垫面类型的产汇流模型,利用MIKE 11 HD水动力模型模拟河道汇流过程,提出面向平原圩区复合下垫面条件的水文水动力耦合模型;并采用BP神经网络进行河道水位预报误差校正,以提高模型精度。选择广州市南沙蕉门河排涝片为研究区,检验耦合模型的水位预报精度,并以2023年“9·7深圳特大暴雨”为移置场景输入,模拟不同排涝措施对河道水位的影响。结果表明:模型能够较好地模拟研究区场次洪水的河道水位过程,率定期和验证期的平均Nash效率系数分别为0.86和0.91,10场洪水中有8场的最高水位模拟误差小于0.05 m;采用BP神经网络校正后所有场次洪水的Nash效率系数均大于0.9,满足洪水预报的精度要求。研究区面临“9·7深圳特大暴雨”场景时存在内涝风险,需提升圩内蓄洪排涝能力。