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The Study on Hydrological Simulation by AVSWAT Model in Plain Areas of Hebei Province

Author: ZhangJingZuo
Tutor: YangLuHua
School: Agricultural University of Hebei
Course: Agricultural Soil and Water Engineering
Keywords: Distributed hydrological model Geographic Information Systems (GIS) SWAT model Runoff Simulation
CLC: P333
Type: Master's thesis
Year: 2011
Downloads: 138
Quote: 1
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Abstract


Water is the carrier of life, is an essential strategic resource of national and social development. Especially in recent decades, with the large-scale economic development, water resources appear a new feature, the impact of climate change and human activities on water resources more and more attention. Changes in land use patterns to some extent affected area runoff, and Chinese scientists also made clear that the country's average temperature will rise, increased precipitation, these changes will certainly affect the regional runoff. Runoff simulation and water balance calculation, is also a very important part of the very foundation of the non-point source pollution calculations. Hydrological model to study the hydrological variation, distributed hydrological model is the focus and hotspots of hydrological modeling research in recent years, as a representative of one of the distributed hydrological model SWAT model in runoff simulation, non-point source pollution, agriculture management measures have a wide range of applications. Based on access to a large number of domestic and foreign literature, select a region of Hebei plain areas as the study area, the SWAT model simulated runoff in the region, the main results are as follows: (1) assisted in the GIS software under study spatial database and attribute database. Including spatial databases including digital elevation model (DEM) maps, land-use way map and the soil type maps, property database including precipitation, temperature, wind speed and other meteorological database, land-use attribute database and soil properties database. (2) analysis of a digital elevation model (DEM) of the study area map, and extraction of digital drainage basin watershed discretization, selected sub-basin catchment area threshold 2500hm ~ 2, the study area is divided into 37 sub-basin. After the threshold to determine land use patterns and soil types threshold of 20% and 10%, respectively, 37 catchments in the study area is divided into 73 hydrological response units HRUs. (3) for the study area and to identify a greater impact on the main parameters of the runoff simulation results that runoff curve number CN2 soil saturated hydraulic conductivity SOL-K, available soil water SOL-AWC soil evaporation compensation coefficients ESCO, groundwater recharge delay time GW-DELAY and base flow regression coefficient ALPHA-BF and analysis of the relationship between these parameters and runoff, and lay the foundation for model calibration and verification. (4) runoff simulation results affect the larger parameters determined by manual trial and error method, the model of the study area in 1998 and 1999, the monthly measured runoff calibration calibration period runoff correlation coefficient R the 0.98 model efficiency coefficient the Nash-Suttcliffe uncertainty factor Ens 0.97. The model calibration to determine the parameter values, and then take advantage of the monthly measured runoff in the study area in 2000 to validate the model, the validation period runoff coefficient R 0.94, model efficiency coefficient The certainty coefficient of Nash-Suttcliffe Ens to 0.76. Runoff calibration and validation of the correlation coefficient R and model efficiency coefficient the Nash-Suttcliffe uncertainty factor Ens meet the SWAT model simulation accuracy and to verify the applicability of the SWAT model in the region, to illustrate the use of the SWAT model for the region runoff simulation feasible. (5) This paper, from a theoretical point of analysis of changes in other conditions remain the same in the case of a temperature, precipitation, land use patterns, and other factors, the variation in the area runoff may occur.

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CLC: > Astronomy,Earth Sciences > Geophysics > Hydrological Sciences (water sector physics) > Hydrological analysis and calculation
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