Research On Storage And Exploitation Models For Rainwater And Flood Resource Based On Eco-enviromental Water Requirement

Whereas contradiction between water supply and water demand became more and more deteriorative in Haihe River basin, the ecological healths status and eco-enviromental water requirement of principal rivers and important wetlands ware approached. Applying integrated dispatching technology for rain and flood resource management based on the engineering measures and non-engineering measures, the storage and exploitation models for rainwater and flood resource ware studied with emphasis.(1)Approaching from the connotation of river system health, the theory constitution of an integrated river health status assessment system (IRHAS) was established which consider water supply condition, water quality, the physical structure of channels bed and biology index status, social significance and public cognition on river. Then, an eco-enviromental water requirement calculation model for river system was created considering river's multiple functions including principal ecological, self-depuration, scouring and landscape. A health index edifice for wetland water ecological system was established, moreover a calculation model was created which considering the primary ecological environment water demand and supplemental water per-year. After the analysis on hydrology dates the real dates acquired from hydrological stations in Haihe basin, system health status of principal rivers and wetlands were discussed, furthmore, the eco-enviromental water requirement for principal rivers and wetlands in this district were investigated and studied based on those calculation models described above.(2) A demonstration module for impounding process was programmed to meet real-time calculation on impoundage and impounded area of detention basin. A comprehensive impounding evaluation system for detention basins was presented. Coupling with rivers, draw-gates, flood diversion orifices and detention basins, a combined schedule system of hydrographic net was established by applying present water conservancy facilities. Finally, general implement strategy of rainwater and flood resource utilization was discussed for releasing water resource crisis and improving water ecological environment.(3) Taking on the aim of meeting river basic Eco-enviromental water requirement, a one-dimension hydrodynamic and water quality coupling numerical model of Chaobaihe-Qinglongwanjianhe-Yongdingxinhe drainage network was created, and research emphasizes ware focused on development pattern for rainwater and flood water resource impounding into the depression land and flood detention area during flood season. Rsearch achievements can contribute to unambiguous quantilzing indexes and water resource allocation budgets for river ecological renovation engineering and flood resource utilization programming in the future.(4) Main missions of representative flood risk management process were discussed followed by a risk recognition and quantitative evaluation method for rainstorm and flood resource storage project using wetlands, floodplains and reservoirs. A two dimensional risk decision-making system model was created for maximal net risk benefits consisted of water resource storage benefits and economic losses.(5) A sectional groundwater equilibrium model integrated with artifical recharge for reconditioning groundwater resource was created. Considering the feasibility of recharging groundwater by utilizing rainwater and flood in Haihe River Basin, implementing methods and fundmental theories of recharging freshwater in preventing seawater intrusion ware studied. Three engineering countermeasures such as injection system,pumping system and injection-pumping integrating system ware proposed to cure seawater intrusion in littoral area.A two-dimension cross-section numerical model for variable density groundwater and solute transport was established to explore the efficiency of those engineering programming.