Acta Geographica Sinica ›› 1995, Vol. 50 ›› Issue (3): 264-271.doi: 10.11821/xb199503009

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A DYNAMIC PRECIPITATION-RUNOFF MODEL FOR A WATERSHED BASED ON GRID DATA

Shen Xiaodong, Wang Lachun, Xie Shunping   

  1. State Pilot Laboratory for Island and Coastal Exploitation, Nanjing University. Nanjing 210093
  • Received:1993-10-01 Revised:1994-05-01 Online:1995-05-15 Published:1995-05-15

Abstract: After having studied the precipitation-runoff process affected by the spatial and temporal variability of precipitation and the spatial differences of physi-geographic parameters on the earth’s surface, this paper developed a dynamic model based on grid data. The model takes topographic map.soil distribution map. land use map. precipitation. evaporation. seepage and moisture content of soils as inputs. The hydrological grid data base is supported by the Geographic Information System (GIS). XMGIS 2. 0, which is made by the authors. According to the model, necessary analyses of digital topographic model and grid superposition are made, and the grid element assigned grade and flow forms a fully watershed (Fig. 2).When the runoff yield and the inflow of surface and subsurface. taking the grid element as a unit . are respectively calculated. the outflow of a grid element is one of inflows in the corresponding subgrid. All the grid element is continuously calculated in the order of grade , and the flow process in every time interval is finally obtained.

Key words: Geographic Information System (GIS), dynamic runoff precipitation watershed model, grid element, Holtan Model, Muskingum method

CLC Number: 

  • P333.1