Study on the Parameters' Acquisition Method of Distributed Hydrological Model Based on RS

Parameters’ acquisition is a key step for the distributed hydrological model when simulating a basin. Based on remote sensing technology, this article proposed a parameters acquisition method of distributed hydrological model. That is extracting the important ground objects’ information from the images to obtain some parameters of the model. This article also used the hierarchical classification principle, and introduced the extraction method of several ground objects. At last, by means of TopModel, we simulated the Xueye Reservoir, Laiwu City in Shandong Province. The experiment shows that this method can effectively improve the accuracy of model simulation. 1 Presentation of Questions Distributed hydrological model is a kind of hydrological model, the model's advantage is able to take into account vegetation, soil, topography and other factors’ impact on the hydrological processes in the watershed, and the spatial differences that existent in these elements can more accurately reflect the actual movement of hydrological [1]. So this model has been widespread concern in actual production. However, parameters used in distributed hydrological model generally have physical meaning, using the usual means of obtaining these parameters is more difficult, it limits the application of distributed hydrological model. As the improvement of remote sensing technology, now we can easily access remote sensing image of high-resolution and high spectrum, obtaining the soil, vegetation, geomorphology, topography, land use and other information underlying surface based on remote sensing become an effective mean. At present, there hasn’t formulation of parameters’ acquisition method on the distributed hydrological model, the parameters’ acquisition only exists as necessary stage in the process of hydrological modeling. In the study of watershed distributed hydrological model based on spatial information technology, Ling Feng referred to the parameters’ acquisition of distributed TOPMODEL, mainly obtained the ground cover and soil data. Based on remote sensing technology, this article studied the parameters’ acquisition method distributed hydrological model.