Large-scale coupled hydrologic and hydraulic modelling of the Ob river in Siberia
Large-scale coupled hydrologic and hydraulic modelling of the Ob river in Siberia
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DOI：
10.1016/j.jhydrol.2009.09.054
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发表时间：
2009-12-15
影响因子：
6.4
通讯作者：
Mognard, Nelly M.
中科院分区：
文献类型：
--
作者：
Biancamaria, Sylvain;Bates, Paul D.;Mognard, Nelly M.
西伯利亚西部的鄂毕河是北极地区最大的河流之一，具有复杂的水文循环，主要由春季的积雪融化和夏季/秋季的降雨和蒸散驱动。Ob是北冰洋的淡水来源，其制度的变化可能会影响海洋温盐环流。由于北极地区缺乏现场测量，而且该地区面积很大，因此很难对北极大型河流进行水文建模。为了模拟鄂毕河流域的北方部分，将陆面方案ISBA（土壤-生物圈-大气之间的相互作用）与洪水淹没模型LISFLOOD-FP相结合。对输入数据和参数进行了不同的敏感性试验，并将结果与现场测量和遥感水位观测结果进行了比较。最好的建模是在河深为10米，曼宁系数为0.015的情况下获得的：现场测量的相关性和纳什-萨克利夫系数分别等于或略高于0.99和0.95（取决于所用的降水数据集）。敏感性测试表明，建模误差主要与大气输入（雪和雨降水），积雪和排水参数化ISBA和曼宁系数，河流深度和洪泛区地形LISFLOOD-FP。(C)2009爱思唯尔有限公司版权所有。
The Ob river in Western Siberia is one of the largest rivers in the Arctic and has a complex hydrological cycle mainly driven by snow melting in spring and rainfall and evapotranspiration in summer/autumn. The Ob is a source of fresh water for the Arctic Ocean and a change in its regime could affect the ocean thermohaline circulation. Due to the scarcity of in situ measurements in the Arctic and the size of the region, the hydrological modelling of large Arctic rivers is difficult to perform. To model the northern part of the Ob river basin, the land surface scheme ISBA (Interactions between Soil-Biosphere-Atmosphere) has been coupled with the flood inundation model LISFLOOD-FP. Different sensitivity tests on input data and parameters have been performed and the results have been compared with in situ measurements and remotely sensed observations of water level. The best modelling is obtained with a river depth of 10 m and a Manning coefficient of 0.015: correlation and Nash-Sutcliffe coefficients with in situ measurement are equal or even slightly above (depending on the precipitation dataset used) 0.99 and 0.95 respectively. The sensitivity tests show that modelling errors are mainly linked with atmospheric input (snow and rain precipitation), snow cover and drainage parameterization for ISBA and Manning coefficient, river depth and floodplain topography for LISFLOOD-FP. (C) 2009 Elsevier B.V. All rights reserved.