新安江模型在汉江江口流域的应用及适应性分析

The applicability study of Xinanjiang model on simulation ofrainful-runoff and flooding hydrographs in Jiangkou basin

针对汉江褒河流域上游江口地区的地形地貌及气候特征,根据1981年～1985年连续5年的逐日水文观测资料,在运用三水源新安江模型采用分层分析的方法对模型的参数进行率定的基础上,对该地区日流量与次洪流量过程进行了模拟,模拟分析表明,降水资料的处理对模型模拟精度有重要影响。日流量模拟的效率系数绝大部分在0.83以上,次洪流量模拟的效率系数都在0.88以上,模型在研究区域得到了成功的应用。

In regarding to the topographic and weather conditions of Jiangkou catchment at upstream of Baohe drainage area in Hanjiang basin, based on the continuous 5 year's daily hydrological observations from 1981 to 1985, the daily discharge hydrographs for 5 years and hourly flooding processes for two flooding events are simulated with Xinanjiang model with three water resources in a semi-distributed schemes. The calibration and verification of modeling parameters are conducted with numerical analysis for each layered substratum. The simulation experiments show that the accurate interpolation of precipitation to each delineated sub-watershed is very essential for the accuracy of the modeling performance. The efficiency coefficients of the modeling performance for daily hydrograph simulations are mostly above 0.83, and the hourly flooding process simulations performed much better, with the modeling efficiency coefficients for two flooding events higher than 0.88, which implies the excellent applicability of the Xinanjiang model on hydrograph simulation and flood forecast.