摘要
为研究DEM分辨率对VIC模型水文模拟精度与运行效率的影响,选用0.5~5.0′的DEM对浊漳北源上游地区进行了月径流模拟。在以纳什系数、确定性系数和相对误差为模拟效果评价指标的基础上,采用均值变点法分析水文计算单元数量和相对误差的变化趋势,探讨DEM尺度效应的最佳拐点。研究结果表明:DEM分辨率对水文计算单元数量的划分影响显著,数量变幅最大达到了98.13%;纳什系数、确定性系数和相对误差受DEM分辨率的影响较小,三者的变化幅度在率定期为0.019%、0.009%、11.879%,在验证期为0.009%、0.012%、9.552%;1.0′的DEM能够在保证模拟精度的前提下显著提高模型的运行效率,为DEM尺度效应的最佳拐点。
In order to research the impact of DEM resolution on hydrological simulation accuracy and operating efficiency of VIC model,this paper simulates the monthly runoff in the upper reaches of north source of Zhuozhang River through the 0.5′~5.0′DEM.In addition,taking the Nash coefficient,deterministic coefficient and relative error as the evaluation indicators of the simulation effect,it analyzes the variation trend of the number and relative errorof hydrological calculation units by the mean change point method,and discusses the optimal inflection point of the DEM scale effect.The results show that:(1)The resolution of DEM has a significant influence on the division of the number of hydrological calculation units,with the maximum number change rate of 98.13%;(2)The Nash coefficient,deterministic coefficient and relative error are less affected by the DEM resolution,with the change rate of 0.019%,0.009%and 11.879%respectively in calibration period,and 0.009%,0.012%and 9.552%respectively in verification period;(3)1.0'DEM can significantly improve the operating efficiency of the model under the premise of guaranteeing the simulation accuracy,which is the optimal inflection point of DEM scale effect.
作者
石彬
任政
孟鹏飞
贾腾飞
SHI Bin;REN Zheng;MENG Pengfei;JIA Tengfei(Institute of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056001,China)
出处
《人民珠江》
2020年第2期61-66,共6页
Pearl River
基金
中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金(IWHR-SKL-KF201812)
关键词
VIC模型
DEM分辨率
径流模拟
浊漳北源
VIC model
DEM resolution
runoff simulation
north source of Zhuozhang River
