Research On Regional Distribution Regularity And Runoff Simulation In Tianshan Mountains

A large number of inland rivers rise in the Tianshan Mountains located in central part of Xinjiang. With the development of society and economy, we have to face the challenges of flood, drought, pollution and others which are related with water security. Aiming at these questions, the runoff relationship of mountainous rivers is crying out for analysis, which would provide important supports for flood control, combating the drought and rational use of water resources.Hydrological model is a valuable means of simulating runoff formation and forecasting disaster. Traditional hydrological model usually need the observation data for a certain period to determine and test parameters. On the region which has no information or lack of information but demands extremely using the model to estimate the runoff, the parameters of hydrological model can't be gained, and this will limit the application of hydrological model. If establishing the relationships between model parameters and physical geographic factors, such as weather, hydrologic, landform, soil and vegetation, we can raise the model application level through interpreting hydrological phenomenon by the view of earth science. Consequently, it has important practical significance and broad applied prospects to acquire regional regularity of model parameters in Tianshan Mountains.With the widely used Xin′anjiang model in China, adding snow-melt runoff model, this paper simulated the stream flow of typical watersheds. considered the physical geographic factors, and focused on the analysis of regional regularity of parameters, such as K, WM, WLM, WDM, C, B and RA. The results shows that K, affected by solar radiation, temperature and moisture, shows a general trend of decreasing progressively from west to east and from north to south; WM, affected by precipitation, evaporation, soil and vegetation, shows a general trend of increasing progressively from west to east and the value is between 150 and 190; WUM and WLM are related to vegetation; WUM and WUM+WLM shows a general trend of decreasing progressively from west to east and from north to south; C, related to vegetation, shows a general trend of increasing progressively from west to east and from north to south and the value is between 0.09 and 0.12; B, applied to reflect the inhomogeneity degree of the ground layer characteristics, is between 0.4 and 0.5; RA, mainly influenced by solar radiation and temperature, shows a general trend of increasing progressively from north to south and the value is between 0.38 and 0.4.This study has a great referential value for determining parameters of other basins in Tianshan Mountains. It also has great practical significance to establish flood forecasting system and water-resource planning.