Sensitivity analysis of SWAT model to the spatial rainfall distribution and watershed subdivision in streamflow simulations in the Mediterranean context: A case study in the Joumine watershed. Tunisia

2013 5th International Conference on Modeling, Simulation and Applied Optimization (ICMSAO) Pub Date : 2013-04-28 DOI:10.1109/ICMSAO.2013.6552706

J. Aouissi, S. Benabdallah, Z. L. Chabaane, C. Cudennec

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引用次数: 11

Abstract

The spatial variability of rainfall is often regarded as significant source of uncertainty in hydrological modelling like the Soil and Water Assessment Tool (SWAT). The objective of this work was to study the sensitivity analysis of SWAT model for a spatial distribution of rain gauges network as well as the subdivision of watershed. The lapse rate of precipitation was calculated from the relation between mean annual precipitation and elevation. It is for 70 mm/100 m. The Soil and Water Assessment Tool (SWAT) model was applied using 5 precipitation gauges and 5 watersheds delineations features. Seven methodologies precipitation options input in the model were implemented for studying the sensitivity analysis of SWAT. Simulated and measured streamflow at the watershed outlet were evaluated. Results were not calibrated. SWAT is extremely sensitive to spatial distribution of rain gauges but it is slightly affected by watershed delineations.

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SWAT模型对地中海流域降水空间分布和流域划分的敏感性分析——以Joumine流域为例。突尼斯

在水土评估工具(SWAT)等水文模型中，降雨的空间变异性通常被视为不确定性的重要来源。本研究的目的是研究SWAT模型对雨量计网络空间分布和流域细分的敏感性分析。根据年平均降水与海拔的关系计算降水的递减率。适用于70毫米/100米。利用5个降水量具和5个流域圈定特征，应用SWAT模型。为研究SWAT的敏感性分析，在模型中输入了7种方法沉淀选项。对流域出口的模拟流量和实测流量进行了评价。结果未校准。SWAT对雨量计的空间分布极为敏感，但受分水岭划定的影响较小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2013 5th International Conference on Modeling, Simulation and Applied Optimization (ICMSAO)

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