摘要
为实现中小流域降雨径流过程精细化模拟,合理估算水文模型参数的空间分布具有重要意义。基于新版全球数字土壤制图系统(SoilGrids)构建栅格新安江模型(GXM)参数化方案,对陕西省陈河流域2003—2012年16场洪水进行模拟,与新安江模型计算结果进行对比,开展基于洪水过程划分的自由水蓄水容量敏感性及空间分布特征量化分析。结果表明:GXM模拟的峰现时间误差水平降低约0.31 h,洪峰和洪量模拟精度较高,模型能够对土壤水饱和度等水文要素的动态空间分布进行较合理的模拟;自由水蓄水容量参数对洪峰和涨洪过程的确定性系数以及涨洪段的洪量相对误差影响较大,对退水过程影响小;自由水蓄水容量在陈河流域河谷和山脊附近较大,坡段中部较小。
To finely simulate the rainfall runoff process in small and medium-sized watersheds,rational estimation of the spatial parameters of the distributed hydrological model is of great importance.Utilizing the new version of the Global Digital Soil Mapping System(SoilGrids),this study developed a scheme to obtain spatial parameters for the Grid-Xin′anjiang Model(GXM).Sixteen selected flood events in the Chenhe watershed of Shaanxi Province from 2003 to 2012 were simulated using the GXM model,which were compared with those of the Xin′anjiang model(XAJ).The sensitivity of free water storage capacity and its spatial distribution characteristics were quantitatively analyzed in various flood phases.The results indicate that the GXM simulation reduced peak time error by approximately 0.31 h,with high accuracy of peak discharge and runoff depth,and that dynamic spatial distribution of hydrological elements,such as soil moisture,can be reasonably simulated.Free water storage capacity significantly impacted the deterministic coefficients of flood rise,peak phases,and relative runoff volume error during flood rise,but insignificant influence on flood recession.Free water storage capacity in valley and ridge areas is greater than that in middle segments of slopes.
作者
童冰星
李致家
姚成
TONG Bingxing;LI Zhijia;YAO Cheng(College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China)
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2022年第2期219-226,共8页
Advances in Water Science
基金
国家自然科学基金资助项目(52079035)
中央高校基本科研业务费专项资金资助项目(B200203052)。
