为减小河道栅格对地形指数分布的影响,引入适度指数法获取流域生成河道的起始临界值,并作为流域中河道栅格的上坡集水面积,使计算的地形指数更符合实际情况。基于TOPMODEL原理与地形指数计算的原理与流程,以腰古流域为例,采用次洪资料对模型进行了参数率定与检验。结果表明,TOPMODEL模拟精度较高。 In order to reduce the impact of grid on the topographic index distribution, a suitable index method is introduced to obtain the initial threshold value of river channel generation, and as the catchment area of ​​the river grid in the river basin, the calculated topographic index is more in line with the actual situation . Based on the TOPMODEL principle and the principle and process of topographic index calculation, take the ancient bank of the Yellow River as an example, the data of the model is calibrated and tested by the second flood data. The results show that TOPMODEL simulation accuracy is high.