Study On Ecological Water Requirement Of Freshwater Wetland In Yellow River Delta Natural Conservation Area Based On SOBEK Model

Recently, because of the reduction of water and sand resources coming into the Yellow River Delta, channellizing of riverway, developing of agriculture, citifying and so on, ecosystem in Yellow River estuary, especially freshwater wetland, appeared ecology degeneration, area shrinking, biologic diversity decreasing and serious ecology unbalance problems, which threaten ecosystem stabilization of Yellow River Delta, and sustainable development of economy society. So, supplying water and guaranteeing basic ecologic use is the key of sustaining and rebuilding estuary ecosystem.Make freshwater wetland in Yellow River Delta as study object, and make water quantity simulation and distribution as subject. Firstly, analyse the data from Yuwa. to sea, and set up one-dimension SOBEK model, which based on Saint-Venant equation, dispersed by ADI scheme, solved by matching pursuit method. And the result accords to the real situation. Then, based on DEM data of wetland, set up two-dimension SOBEK model, and solve it the same as one-dimension method. According to past years SPOT images, and water and sand quantity, confirm the area of reed wetland restoration, and make corresponding project measure. At last, make better projcet between water quantity of Yellow River and demand of reed growth, and overflow result accords to the both need.Results indicate that it's feasible of calculating ecology water demands in Yellow River Delta by SOBEK model, and make a new method. The research supports for wetland ecology water demand, protecting estuary ecosystem, and water resources manage and attemper. This is one of the key problems about maintaining the healthy of Yellow River.