Yanshan Reservoir Flood Storage Based On Distributed Hydrological Model Prediction

With developing more quickly in digitalization in modern society, The Distributed Hydrology Model founded on Digital Elevation Models are becoming more and more important in water conservancy, It avoids the way of the Accustomed Hydrology Model on many years of hydrological statistical data, but on geographic information and other interrelated experimental data in one drainage area, it breathe a new power into water conservancy. Because the Distributed Hydrology Model relates to the modern computer, it will have strong vital force.Making use of this model I have a taste in Yan Shan Reservoir watershed in He Nan Province: I start on the information of the surface in this area, give every grid cell the proper parameters by distilling them from the map of how the people use soil and the map of soil type in this area; In order to get the topographical information, I add numerical value to a abundant of contour lines and points in topographical map, use the software Arc View of GIS to create Digital Elevation Models (DEM) automatically, get every volume of the reservoir from the water level 99m to 117m. By using a special module of the software, I distill triumphantly the grid cells' elevation value, slope value, flow direction, flow accumulation, watershed, stream network, isochrones and so on. The proper hydrology model on the gird cell plays an vital role in the Distributed Hydrology Model, In this paper, It is divided two parts in vertical section, they are up-ground and under-ground relating to rainfall, air temperature, evaporation and ooze hydrological model, At the same time, I integrate all indispensable data and found two databases which are geographical information database and hydrological information database, write program using computer language—VB to simulate process of isochrones of the watershed. How much the water flow from the exit of watershed every interval time is decided by how many the grid correspondingly, but the number of the grid of every interval time is not fixed, but always changed, it is decided by velocity of flow on grid, but the velocity of flow is decided by how much the rain falls in the area every interval time. At last, this model is validated by two floodwater in 1998 in the area, because the reservoir is not completed, in order to test how much water flew to reservoir in the two floodwaters, isochrones process of the watershed is simulated, the results fit well.