A Study On Dam System Planning Spatio-temporal Computer Model Based On GIS

Dam system is composed of small watershed. It's a silt-retention dam project which is built in the valley for purposes of flood detention, sediment storage and silt retention. There are some shortages in area measure, valley line distilling, valley cross section drawing and other watershed characters analysis when planning manually, such as time consumed, hard sledding, low efficiency. It's more complex when relates to flood regulation routing. It's a key to improve dam system designing and managing level using efficient and scientific means. This paper studies spatio-temporal model based on GIS under the background of dam system planning in Loess Plateau. The study takes the influence of dam building order, flood, distributing of sedimentation and downstream water delivery into account, finishes the work that can't be done manually. Based on the equilibrium theory, the study combines analysis of the data already have with field investigation, abstracts the construction of dam system. After necessary hypothesis, the model is divided into little valley topographical model and professional model of dam system planning. This paper particularly illuminates each sub-system's function, interface, return and method of model construction of professional model of dam system planning, finally constructs spatio-temporal computer model of dam system planning.The application result indicates that the model can simulate all conditions that must be considered and build orderliness when planning dam system, such as order of dam building, flood's movement in whole dam system. It realizes the flood regulation of whole dam system, and the result is right and feasible. Usually the work which will cost two or three men two to three months completing, when use this model, it will be finished in a week, including field investigation. The efficiency is high improved. This study will offer a scientific, handy and visual means for dam system planning and designing, improve work efficiency and save a lot of cost. At the same time, it will offer a scientific technical method of dam system building, improve ecological benefit, economic benefit and social benefit. It's very important for sustainable utilization of water resources, ecology safe, entironment of Loess Plateau and sustainable development of social economy.