Water Quantity&Quality Model For Large Scale River Networks With Multi-sluices And Its Application

Among many fields including water conservation, eco-environmental protection, it is consensus that the construction and operation of sluices&dams make pressure on river eco-environmental system. And it is a difficult and hot issue that how to reduce the pressure of sluices&dams and realize the operation with lower environmental impact. Exploratory practices wihin recent years show that ecological regulation is most feasible way to reduce the pressure of sluices&dams on river eco-environmental system. The current stage goal of ecological regulation is resuming and improving river water quality in China, its premise is scientific quantification of hydrological and environmental effect of sluices&dams. Developing water quantity&quality model for multi-sluices river is a basis of the quantification, which could provide scientific guide for establishing ecological regulation scheme of sluices&dams. More over, water quantity&quality model is a core in river water quality prediction and pre-warning, which could provide technical support for emergency response of water pollution accident in heavily polluting rivers with multi-sluices.The water quantity&quality issue is very complex in large scale river networks with multi-sluices, its subjects involved is broad, which mainly include hydrology, hydraulics and water quality. A water quantity&quality model for large scale river networks with multi-sluices has been established based on cross integration of hydrology, hydrodynamics and water quality. The modle adopts modular structure and its framework is one and two-dimensional nesting. The model consist of several below parts:river runoff simulation, sluice scheduling simulation, river water quality simulation, local inflow and river pollution load estimation, water quality real-time correction, river runoff simulation part includes one-dimensional hydrodynamic model for river network, hydrological runoff routing modle and depth-averaged two-dimensional hydrodynamic model. river water quality simulation part includes one-dimensional water quality model for river network and depth-averaged two-dimensional water quality model. local inflow and river pollution load estimation part includes local inflow estimation model and local river pollution load estimation model.Based upon above theoretical research, positive analysis will be carried out in middle network of Huaihe River basin, which is a typical heavily polluting river with multi-sluices in China. The network is mainly made up of Huaihe main stream, Shayinghe River, Guohe River, Shihe River and Pihe River, which is key region of water pollution joint-prevention, where13large sluices have been constructed.1D and2D coupling flow and water quality model for middle network of Huaihe River has been developed. Its modular structure is made up of three1D parts and two2D parts:1D parts for important region of water pollution joint-prevention, Shayinghe River, Guohe River;2D parts for Lutaizi Reach and Benbuzha Reach. The water quantity and quality series during1June to31December2004were selected to calibrate the1D model, and the series during1January to31December2008were selected to validate the1D model. The series during8June to31July2004were selected to calibrate the2D model, and the series during1March to31May2008were selected to validate the2D model. The results of calibration and validation show that, the established model could refelect the routing law and feature of flow and pollutant in middle network of Huaihe River to a well extent.In order to make the water quantity&quality model support river basin water environment early warning and management better, the Huaihe water environment early warning and management system has been developed adopting J2EE. ArcGIS Server has been selected as the GIS platform, and Google Maps API is applied, which make a geospatial environment coupling local vector data and internet satellite images. Adobe FLEX has been adopted as Rich Internet Application development tool, which balances the system loads better and beautifies the client pages. Case Applications were carried out to pollution accident in July2004and water quantity&quality seires during July2012, the results shows that, this system could provide technical support for the Huaihe water environmental protection, including digital information management of water environmental data and decision support of water environment early warning.