A macro scale grid based distributed hydrological model is applied to the Huaihe River basin in China (140,000km2). In the modeling, a watershed basin is subdivided into grid boxes according to a grid system of a meso-scale atmospheric model to incorporate atmospheric model outputs. Model parameters are determined by using the data sets obtained in the Shigan River basin during the intensive observation period in 1998. Some runoff simulations showed that channel routing has dominant effect on a simulation of river discharge for a large river basin.
KeyWords :large river basin, the Huaihe River basin, macro-scale hydrological model Table 1 Historical floods in the Huaihe River basin (Qp, peak discharge(m3/sec)). Table 1. 15, 1998). Table 3 Parameter values of lower part of dams. Fig. 12 Comparison between observed and simulated hydrograph at the outlet of the Shigan River basin. In this case, the amounts of dam releases from two dams are multiplied by 0.2 to consider the effect of water taken to the outside of the basin (from May 1 to Sep. 15, 1998).
A runoff simulation system for a large river basin is applied to the Shiguang River Basin (6,000km2) in China. The watershed basin is subdevided into grid boxes with about 225km2 in which rainfall and evapotranspiration are assumed to be obtained by a numerical mesoscale atmospheric model. Runoff from each grid box is calculated and routed along channel networks. The system works well and it will be applied to the Huaihe River Basin (10,000km2) where HUBEX Project is going.
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