...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of hydrometeorology >Modeling Surface Runoff and Water Fluxes over Contrasted Soils in the Pastoral Sahel: Evaluation of the ALMIP2 Land Surface Models over the Gourma Region in Mali
【24h】

Modeling Surface Runoff and Water Fluxes over Contrasted Soils in the Pastoral Sahel: Evaluation of the ALMIP2 Land Surface Models over the Gourma Region in Mali

机译：田园萨赫尔对比土壤的建模表面径流和水势态：马里牙龈地区almip2陆地表面模型的评价

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Land surface processes play an important role in the West African monsoon variability. In addition, the evolution of hydrological systems in this region, and particularly the increase of surface water and runoff coefficients observed since the 1950s, has had a strong impact on water resources and on the occurrence of floods events. This study addresses results from phase 2 of the African Monsoon Multidisciplinary Analysis (AMMA) Land Surface Model Intercomparison Project (ALMIP2), carried out to evaluate the capability of different state-of-the-art land surface models to reproduce surface processes at the mesoscale. Evaluation of runoff and water fluxes over the Mali site is carried out through comparison with runoff estimations over endorheic watersheds as well as evapotranspiration (ET) measurements. Three remote-sensing-based ET products [ALEXI, MODIS, and Global Land Evaporation Amsterdam Model (GLEAM)] are also analyzed. It is found that, over deep sandy soils, surface runoff is generally overestimated, but the ALMIP2 multimodel mean reproduces in situ measurements of ET and water stress events rather well. However, ALMIP2 models are generally unable to distinguish among the two contrasted hydrological systems typical of the study area. Employing as input a soil map that explicitly represents shallow soils improves the representation of water fluxes for the models that can account for their representation. Shallow soils are shown to be also quite challenging for remote-sensing-based ET products, even if their effect on evaporative loss was captured by the diagnostic thermal-based ALEXI. A better representation of these soils, in soil databases, model parameterizations, and remote sensing algorithms, is fundamental to improve the estimation of water fluxes in this part of the Sahel.
机译：陆面过程在西非季风变化中起着重要作用。此外，该地区水文系统的演变，尤其是自20世纪50年代以来观测到的地表水和径流系数的增加，对水资源和洪水事件的发生产生了重大影响。本研究涉及非洲季风多学科分析（AMMA）陆面模型相互比较项目（ALMIP2）第2阶段的结果，该项目旨在评估不同最先进陆面模型在中尺度重现地表过程的能力。通过与内陆河流域的径流估计值以及蒸散量（ET）测量值进行比较，对马里现场的径流和水通量进行评估。还分析了三种基于遥感的ET产品[ALEXI、MODIS和全球陆地蒸发阿姆斯特丹模型（GLEAM）]。研究发现，在深厚的砂质土壤上，地表径流通常被高估，但ALMIP2多峰平均值相当好地再现了ET和水分胁迫事件的现场测量结果。然而，ALMIP2模型通常无法区分研究区域典型的两个对比水文系统。使用明确表示浅层土壤的土壤图作为输入，可以改善模型的水通量表示，从而可以解释其表示。浅层土壤对于基于遥感的ET产品来说也是相当具有挑战性的，即使基于诊断热的ALEXI捕捉到了它们对蒸发损失的影响。在土壤数据库、模型参数化和遥感算法中更好地表达这些土壤，对于改进萨赫勒这一地区水通量的估算至关重要。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号