Application Of Regional Evapotranspiration Based On The Remote Sensing For Water Resource Utilization In Arid Aera

Evapotranspiration research is a fairly broad range of multidisciplinary problem, it comes down to hydrology, meteorology, ecology, agrology, Geographic and many other disciplines. In the arid and semi-arid area where the water resources is lack, accurately estimate the surface evaporation is propitious to quantitative calculation and rational allocation the agriculture and ecological water requirements,and prevent unnecessary water dissipation. With the development of remote sensing technology, using remote sensing technology to invert surface parameters to calculated the regional evapotranspiration gradually become one of the principal ways to calculated evapotranspiration. It can not only access to a regional (basin) of the total evapotranspiration, also available in the region to different categories, different periods of evapotranspiration process, for high-precision remote sensing data, it can even access points on the evaporation process.In this paper,by the characteristics of remote sensing technology and the principle of evaporation we have used single-layer model SEBAL inversion remote sensing in the study area fall YanQi Basin years to a different type of evaporation process, Based on the new generation of remote sensing data MODIS to establish and improve suited to the study of model parameters SEBAL acquiring France, through use the hydrological model to proof the remote sensing methods, seeks to establish a set of regional evapotranspiration dynamic monitoring methods based on the remote sensing technology. This study mainly includes the following:(1)In the model of choice, Based on the analysis of the diversiform remote sensing model and land surface parameters, using the ERDAS IMAGE software and the surface energy balance principle established the SEBAL model. (2) In remote sensing methods, through the use of two different resolution data inversion in the same time, Comparison and analysis of their results, validate and improve the remote sensing SEBAL model calculation methods based on the MODIS data. (3)In the verification and applications of the results, adopted the water balance model which have a clear physical meaning to validate the remote sensing inversion results, and through the combined application of geostatistics, computational geometry and topology analysis, and landscape ecology and other related theories and methods, evaluated the different categories of land to the year evapotranspiration changes, and effectively promote the RS and GIS technology integration.The main conclusions of the work can be summarized as follows : (1) Adoption of this research, Note the use of MODIS data inversion Area evapotranspiration is more feasible, and SEBAL model of the surface albedo and soil heat flux calculation method aimed at examining the actual area of reform Progressive, improved model in the low coverage and the large surface area calculation accuracy, be better for the evaluation of water resources and water-saving irrigation to provide better information. (2) Simulation evapotranspiration Yanqi Basin, a total of about 2.96 billion stere. The relative error for actual hydrological monitoring water consumption is 5.7%. , The Great Lakes, which evapotranspiration is 1.212 billion stere, the small Lakes, which evapotranspiration is 3.83 billion stere, the farmland, which evapotranspiration is 6.97 billion stere, the Lin lawn, which evapotranspiration is 4.08 billion stere, the waste, which evapotranspiration is 3.83 billion stere, the rivers , which evapotranspiration is 0.186 billion stere.