李金城1,高〓伟1,常学秀1,陈〓岩2.子流域划分对HSPF模型径流模拟效果的影响[J].水电能源科学,2018,36(10):27-30
子流域划分对HSPF模型径流模拟效果的影响
Impacts of Sub watershed Division on Runoff Simulation of HSPF Model
  
DOI:
中文关键词:  HSPF  子流域划分  径流模拟  中河流域
英文关键词:HSPF  sub watershed division  runoff simulation  Zhonghe watershed
基金项目:国家自然科学基金项目(41701631);云南大学服务云南行动计划(2016MS18)
作者单位
李金城1,高〓伟1,常学秀1,陈〓岩2 1. 云南大学 生态学与环境学院 云南 昆明 650091 2. 环境保护部 环境规划院 北京 100012 
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中文摘要:
      在水文水质模拟过程中,子流域划分数量直接影响模拟结果的精确度,确定最佳子流域划分方案对提高模拟精确度至关重要。基于PEST HSPF模型,以中河流域为例,在相同参数及不同参数条件下,采用PEST自动校准方法,判断子流域划分数量对流量模拟精确度的影响。结果表明,在相同水文参数下,子流域划分数量变化时,模拟流量的纳什系数(NSE)和可决系数(R2)在0.65~0.78之间波动,其中子流域划分数量在10~20之间对模拟结果的精确度影响最大;在不同水文参数下,径流模拟结果的NSE与R2随子流域划分数量的增加先增大后减小,相对误差(RE)在子流域划分数量介于1~10之间时急剧下降后趋于稳定;子流域划分对HSPF水文模拟效果影响显著,表现出阈值效应,当划分数量超出阈值范围时,径流模拟精度均会受到很大影响。
英文摘要:
      In the process of hydrological and water quality’s simulation, the number of sub watersheds directly affects the accuracy of the simulation results. How to determine the optimal partition scheme is very important to improve the simulation accuracy. Based on the PEST HSPF model, the PEST automatic calibration method was used to determine the influence of the number of sub watersheds on the accuracy of flow simulation under the same parameters and different parameters. The result shows that under the same hydrological parameters, the Nash coefficient (NSE) and the resolvable coefficient (R2) of the simulated flow fluctuate between 0.65 and 0.78, and the number of sub watersheds between 10 and 20 has greatest impact on the accuracy for the simulation results. Under different hydrological parameters, the NSE and R2 of the runoff simulation results increase firstly and then decrease with the increase of the number of sub watersheds, and the relative error (RE) tends to be stable after the sharp decrease of sub watersheds 1 10. Sub watershed division has a significant impact on the hydrological simulation of HSPF and shows a threshold effect. When the number of partitions exceeds the threshold range, the accuracy of runoff simulation will be affected greatly.
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