淮河流域典型洪水年流量空间分布的季节特征

为了分析淮河流域洪水过程空间分布的季节变化特征,提高对典型洪水过程的认识,以TRMM 3B42卫星降水数据为驱动资料,利用分布式陆面-水文模型(LSX-HMS)模拟淮河流域典型洪水年(以2003年为例)的流量过程.结果表明:TRMM 3B42卫星数据能够较好地反映淮河流域降水的时空分布;LSX-HMS模型对流量时间变化过程的模拟精度较高;逐月流量空间分布给出了流域洪水过程的季节变化特征,准确反映了流量从南向北推进进而消退的空间演变过程.分布式水文模型对流量空间分布的模拟预测有助于流域洪水事件的预警与管理.

Seasonal characteristics of spatial distribution of streamflow in a typical flood year in Huaihe Basin

In order to analyze the seasonal characteristics of the spatial distribution of streamflow in the Huaihe Basin and enhance our knowledge of typical flood processes,a distributed land surface-hydrology model(LSX-HMS) was used to simulate the streamflow in a typical flood year(in 2003) in the Huaihe Basin,with the TRMM 3B42 satellite rainfall data being the driving data.The results show the following: The TRMM 3B42 satellite rainfall data can well represent the spatio-temporal distribution of rainfall in the basin,and the LSX-HMS model provides high-precision simulation of the temporal variation of streamflow.Based on the spatial distribution of monthly streamflow,the seasonal variation characteristics of floods in the basin were determined,and the spatial process of streamflow that moved from south to north and finally subsided was identified.The distributed hydrological model that can simulate and forecast the spatial distribution of streamflow is helpful for pre-warning and management of flood events in the basin.