2000 Volume 44 Pages 139-144
In hydrological rainfall runoff simulation, flow routing is one of the most important components. The Muskingum-Cunge routing method is widely used since it is not only conceptually simple, easy to code and efficient to compute, but also has a firm hydraulic basis. However, there are some problems left to be solved before it is applied to a digitized distributed hydrological model. The most important one is the possible occurrence of negative outflows. To avoid it, two methods were developed, the approximation approach and the real-time adjustment of unit space and time intervals. Both were applied to the BTOPMC model (Block-wise use of TOPMODEL with Muskingum-Cunge method) and floods and lowflows of the 3500km2 Fujikawa basin in Japan were simulated. The results indicate that both methods are applicable. In addition, two problems relating to the routing parameters K and X are studied and some practical handling methods are suggested
