不同精度土地利用数据对丘陵灌区HRU划分阈值及产流的影响  

Effects of different resolution of land use data on HRU division threshold and runoff simulation in Hilly Irrigation area

作　　者：王文娟 邹志科 罗文兵[2] 李超超 李亚龙[2] 余蕾[2] 黄绍哲 WANG Wenjuan;ZOU Zhike;LUO Wenbing;LI Chaochao;LI Yalong;YU Lei;HUANG Shaozhe(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Agricultural Water Conservancy Department,Yangtze River Scientific Research Institute,Wuhan 430010,China;College of Resource and Environment,Yangtze University,Wuhan 430100,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]长江水利委员会长江科学院农业水利研究所,武汉430010 [3]长江大学资源与环境学院,武汉430100

出　　处：《东北农业大学学报》2022年第9期8-16,共9页Journal of Northeast Agricultural University

基　　金：国家自然科学基金委员会—中华人民共和国水利部—中国长江三峡集团有限公司长江水科学研究联合基金项目(U2040213);中央级公益性科研院所基本科研业务费项目(CKSF2019251/NY,CKSF2021299/NY)。

摘　　要：为合理确定不同精度土地利用数据下SWAT模型水文响应单元(Hydrologic research unit, HRU)划分阈值,提高模型模拟精度和效率,以漳河灌区杨树垱流域为研究区,设置土地利用、梯度和土壤类型的组合方案,探究5和10 m两种不同土地利用精度对HRU阈值划分和径流模拟效果的影响。结果表明,不同方案下R2和NSE>0.6,RSR<0.7,模型可较好模拟杨树垱流域径流变化过程。在HRU划分过程中,土地利用类型被合并比例随阈值增加而增加,阈值达30%时,农田和水面变化率均超过30%,在低精度土地利用数据下更明显。不同精度土地利用数据在同一阈值下模拟结果相差较小,3种评价指标相对误差均小于15%;在5 m精度土地利用数据下,HRU阈值设定为10%时模拟精度和运行效率最佳。The precise determination of the division threshold of the Hydrological Research Unit(HRU) can greatly improve the accuracy and efficiency of SWAT(Soil and Water Assessment Tool)model simulation when different resolutions of land use data are applied. The Yang-shu-dang(YSD)watershed of Zhanghe Irrigation District in Suoth China was taken as the study area. Accordingly, a distributed hydrological model was established in this study to explore the effects of different land use resolutions of 5 m and 10 m on the HRU threshold and runoff simulation, under the conditions of combined scenarios of land use, gradient and soil type. The results showed that the R2and the NSE were greater than 0.6 and the RSR was less than 0.7 under different scenarios, indicating that the capability of the model well characterized the runoff process of the selected watershed. The proportion of merged land use types by other larger land use increased with the increase of the threshold. When the threshold reached 30%, the change rates of farmland and water surface both exceeded 30%, which was more obvious under low-resolution land use type. The simulation results of different resolution precision land use type under the same threshold showed few differences, and the relative errors of the three scenarios were less than 15%. When the HRU threshold was set to 10%, the simulation accuracy and operation efficiency of the model were the best under the land use data with 5 m resolution.

关 键 词：SWAT模型 土地利用数据精度 水文响应单元 阈值 径流模拟 

分 类 号：S274[农业科学—农业水土工程]