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Sensitivity analysis of the evaporation module of the E-DiGOR model

机译：E-DiGOR模型的蒸发模块的灵敏度分析

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摘要

Sensitivity analysis of the soil-water-evaporation module of the E-DiGOR (Evaporation and Drainage investigations at Ground of Ordinary Rainfed-areas) model is presented. The model outputs were generated using measured climatic data and soil properties. The first-order sensitivity formulas were derived to compute relative sensitivity coefficients. A change in the net solar radiation significantly affected potential evaporation from bare soils estimated by the Penman-Monteith equation. The sensitivitycoefficients were positive, with a mean value of 0.82. The sensitivity of potential soil evaporation to soil heat flux was lower during the summer months and higher during the winter. The gradient of saturated vapour pressure-temperature curve increasedor decreased the potential evaporation rates because of the occurrence of the gradient variable in both the numerator and denominator of the equation. Increases in the vapour pressure deficit increased the evaporation and its effect was more pronouncedin the winter. In the case of aerodynamic resistance, the coefficients were constantly negative, and became more negative in the winter, which means a negative correlation between the input and output. In Aydins equation, the dependent variable (actual soil evaporation) was initially very sensitive to a change in the water potential of a wet soil. The sensitivity decreased progressively during the drying period. The coefficients related to the absolute values of soil water potential were constantly negative, with a mean value of -0.19. The sensitivity of actual soil evaporation to air-dry water potential remained low in the wet soil and was higher in the drier soil. The sensitivity coefficient to measure the impact of potential evaporation on actual evaporation did not change during the study. According to Aydin and Uygur s equation, potential soil evaporation greatly affected the output (soil water potential) in the wet soils. In Kelvin's equation, increases in air temperature increased the absolutevalue of water potential at air-dryness. The sensitivity coefficients, owing to relative humidity, showed a great deal of fluctuation.
机译：提出了E-DiGOR（普通雨养区地面蒸发和排水调查）模型中土壤-水分蒸发模块的敏感性分析。使用测量的气候数据和土壤特性生成模型输出。推导了一阶灵敏度公式以计算相对灵敏度系数。根据Penman-Monteith方程估算，太阳净辐射的变化会显着影响裸露土壤的潜在蒸发。灵敏度系数为正，平均值为0.82。潜在的土壤蒸发对土壤热通量的敏感性在夏季较低，而在冬季较高。由于方程的分子和分母都出现了梯度变量，因此饱和蒸气压-温度曲线的梯度增加或减小了潜在的蒸发速率。蒸气压赤字的增加会增加蒸发量，其作用在冬季更为明显。在空气动力学阻力的情况下，系数一直为负，并且在冬季变得越来越负，这意味着输入和输出之间的负相关。在Aydins方程中，因变量（实际土壤蒸发）最初对湿土壤水势的变化非常敏感。在干燥期间，灵敏度逐渐降低。与土壤水势绝对值有关的系数一直为负，平均值为-0.19。在湿土壤中，实际土壤蒸发对空气干燥水势的敏感性仍然较低，而在干燥土壤中，敏感性较高。在研究期间，用于测量潜在蒸发量对实际蒸发量影响的灵敏度系数没有变化。根据Aydin和Uygur方程，潜在的土壤蒸发极大地影响了湿润土壤的产量（土壤水势）。在开尔文方程中，空气温度升高会增加空气干燥时水势的绝对值。由于相对湿度，灵敏度系数显示出很大的波动。

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