Temporal and Spatial Variation of Evapotranspiration and Its Influencing Factors in Ziya River Basin
Evapotranspiration is a key element of hydrological cycle and water balance.It is of great significance to study the spa-tial and temporal variation law for the optimal allocation of water resources of river basins.The SEBAL model combined with the reference evaporation ratio was used to simulate the evapotranspiration in the Ziya River Basin from 2001 to 2020.The Mann-Kendall trend test and the coefficient of variation method were used to analyze the temporal and spatial variation characteristics.The correlation analysis,partial correlation analysis and path analysis were used to explore the influencing factors of evapotranspi-ration change.The results show:(1)The relative error between the evapotranspiration simulated by the SEBAL model and the mea-sured evapotranspiration data of the eddy correlation system is-7.5％,and the relative error with the water balance calculation re-sult of the sub-watershed is-9.6％.(2)The annual average evapotranspiration of Ziya River Basin is 520.3 mm/a,which shows an upward trend in spring,summer and autumn,with little overall change in winter,and the annual evapotranspiration shows a single peak,mainly concentrated in May to July.(3)The overall spatial distribution characteristics of evapotranspiration in the ba-sin are high in the west and low in the east.Under different underlying surface types,the annual evapotranspiration of water body is the largest,followed by forest land and grassland,and farmland and urban land are the lowest.(4)The change of evapo-transpiration in the basin is directly influenced by net radiation and air temperature,and indirectly influenced by air pressure.
evapotranspirationSEBAL modelspatial and temporal variationZiya River Basin
万方数据
维普
