分布式水文模型EasyDHM在北江流域的应用

Application of Distributed Hydrological Model EasyDHM in Beijiang River Basin

为了解决珠江流域咸潮上溯问题,需要在枯水期对流域水库群进行压咸调度。合理调度的前提是准确掌握流域的来水情况,以便在满足发电需要的基础上兼顾生态需要,特别是在枯水期。飞来峡水库是北江流域的重要水库,位于珠江流域下游,在流域抑咸调度中起到关键的作用。为了对飞来峡水库来水过程进行水文模拟分析,以分布式水文模型EasyDHM为基础,利用DEM、实测河网、土壤、土地利用及水文气象数据,构建了北江流域分布式水文模型。通过模型的参数率定以及验证发现,模型精度较高,可以很好的应用于流域水情形势分析;对飞来峡水库旬入库过程统计发现,枯水期来水量最小值出现在12月上中旬,这对于确定流域抑咸统一调度的最佳时期也有着重要的意义。

In order to solve the saltwater intrusion problem in the Pearl River basin,it is necessary to perform the regulation of suppressing salinity of the reservoir water in the dry season to meet both of the power and ecological demands,and knowledge of the inflow to the river basin in the dry season is the basis for the reasonable regulation.Feilaixia reservoir,located in the downstream of the Pearl River basin,is an important reservoir in the Beijiang river basin and plays a key role in the regulation of suppressing salinity.In order to simulate and analyze the hydrologic process on the inflow to the Feilaixia reservoi a distributed hydrological model,EasyDHM,was established based on the DEM,river network,soil,land use,and hydrological and meteorological data in the Beijing River basin.The parameter calibration and verification of the model indicated that this model has a high accuracy and is appropriate to be used to analyze the hydrologic situation in the Beijiang River basin.The statistics of the inflow to the Feilaixia reservoir showed that the minimum inflow for the dry season occurs in early-middle December,which provides the instructive significance for determining the time to perform the regulation of suppressing salinity.