tailieunhanh - Evapotranspiration Remote Sensing and Modeling Part 7

Tham khảo tài liệu 'evapotranspiration remote sensing and modeling part 7', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Estimation of Evapotranspiration Using Soil Water Balance Modelling 169 Pairs of simulated ơ p 0 Ơ 1 0 n 1 which satisfy both Cy ơ p 20 RN and CE ơ p a with a 30 are finally selected as adequate solutions. Fig. 3 and 4 report model outputs for sets of ơ p fulfilling the above conditions under the assumptions of cases a and b in case where Em information is included. Estimated decadal volumes squares for the selected pairs of ơ p are compared to observed decadal volumes and are reported versus precipitation data. Fig. 3 is related to case a corresponding to the assumption of total watershed contributing to runoff. Fig. 4 is related to case b assuming a contributing area. The results suggest that the introduction of contributing area outcomes produce outputs which result in a better fitting of the rainfallrunoff evolution. In effect in the case of total area contributing no solution is found able to simulate the most rainy decade squares are far from the symbol for the Rainiest decade . Conversely some solutions are found able to reproduce the most rainy decade if we consider contributing area scheme some squares are located near the . Also evapotranspiration information has greatly reduced the interval of acceptable solutions. Effectively selected solutions are such that Ơ and p . 5. Conclusions The simulation of evapotranspiration using the water balance equation is part of hydrological modelling rainfall-runoff models and is also important in the framework of global circulation models Land surface models . A lot of models are now functioning and their formulation is based on different assumptions on soil characteristics in relation with soil moisture transpiration schemes as well as infiltration and runoff schemes. Empirical models for estimating regional evapotranspiration are worth noting for estimating average long term evapotranspiration. They are generally based on climatic information rainfall and potential evapotranspiration . They .

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