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Pan X.,Beijing Institute of Water | Pan X.,Beijing Engineering Research Center for Non Conventional Water Resources Utilization and Water Saving | Li Q.,Beijing Institute of Water | Li Q.,Beijing Engineering Research Center for Non Conventional Water Resources Utilization and Water Saving | And 4 more authors.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2015

Watershed flood simulation for urban areas is important for river safety and flood control, but it is a difficult issue due to its complicated factors. Based on a one-dimensional MIKE11 model, we integrated on the model platform the processes of runoff generation in impervious areas, multi water projects control, regional drainage, and tributaries confluence, and constructed a coupled modeling system of Qinghe watershed flood in the urban area of Beijing. The river and floodgates hydraulic parameters are validated with design flood volume and its corresponding water level data of 20 year and 50 year return periods. And the floodgates operating rules are validated with the water level data from the storm and flood events in July 21 in 2012.The simulations shown a good agreement with the water level, total flood volume, and peak value monitored at eight floodgates. Application of this model to different scenarios of design storms shows that low water level corresponds to relative high flood volume and the river can undertake flood volume of 20 year rainfall return period. The riverbank in the middle reach between the floodgates of Qinghe and Yangfang is the most serious area for flood control. For the rainfall return periods from 1 year to 20 year, the ratio of final volume of storm water into the river over the river storage capacity is in the range from 33.5% to 54%. This study would supply a guide to flood control and storm water utilization assessment in the watershed of urban area ©, 2015 All right reserved. Source


Yang Y.,Beijing Institute of Water | Yang Y.,Beijing Engineering Research Center for Non Conventional Water Resources Utilization and Water Saving | Zheng F.,Beijing Institute of Water | Zheng F.,Beijing Engineering Research Center for Non Conventional Water Resources Utilization and Water Saving | And 3 more authors.
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2016

On the basis of summarizing predecessors'groundwater model and land subsidence model, the water flow and land subsidence coupling model has been built on considering the correlation between porosity and permeability coefficient. In order to realize and simulate the coupling process between water flow and land subsidence, the source code of Modflow that is a common international program has been improved. In order to verify the modified program, a typical example has been established. The results show that the subsidence rate is faster than conventional groundwater theory when the hydraulic properties changes are considered in the coupled model. The reason is perhaps that the water level decline due to groundwater withdrawal induces the soil compression and the porosity and permeability decrease. Decrease of permeability produces hydraulic gradient and seepage forces that may result in accelerated subsidence. Therefore, the effect of the nonlinear hydraulic properties is an interactive process of pore water pressure and soil consolidation deformation and should not be ignored. Furthermore, the result can prove that the modified program can simulate the coupling process. This research can offer technical support for land subsidence and water flow coupling simulation. © 2016, The Editorial Board of Journal of Basic Science and Engineering. All right reserved. Source

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