分布式水文模型在山洪雨量预警指标确定中的应用

Application of Distributed Hydrological Model in Determination of Mountain Torrent Warning Index

鉴于小流域山洪具有突发性,预警指标确定难度较大。以庙下溪小流域为例,提出基于HEC-HMS分布式水文模型的小流域设计洪水计算方法,并运用水位流量反推综合确定山洪雨量预警指标。结果表明,该方法的设计洪水计算结果与浙江省推理公式、瞬时单位线计算结果相差不大,与实际的山洪灾害降雨资料也较吻合,可见其确定的雨量预警指标基本合理,HEC-HMS模型在山洪雨量预警指标确定中具有可行性。

The determination of warning index is difficult because of the idiopathic sudden of mountain torrent in small watershed.Taking the Miaoxia small watershed for an example,this study put forward to calculate design flood for small watershed by using HEC-HMS distributed model,and determined the warning index of mountain torrent with the inverse method of water level and flow.The application results show that the design flood calculation result of this method is almost the same as the calculated result by using Zhejiang rational formula,instantaneous unit hydrograph,and the warning index is reasonable.The HEC-HMS distributed model is the referable for the selection of mountain torrent warning index.