基于SWAT模型的大安市降水入渗量变化的模拟研究

Research on Simulation of Precipitation Infiltration Variation with SWAT Model in Da'an City

针对近年的研究热点,通过SWAT模型对半干旱、盐碱化严重的吉林省大安市进行降水入渗模拟。以2000、2004和2008年遥感影像解译得到的土地利用数据为基础,结合SWAT模型的模拟结果,讨论LUCC与降水入渗量的相关关系。2008年与2000年相比,难利用地的面积有所降低,旱地、草地等发生了大面积的增加,研究区内土地状况有所好转。通过SWAT模型运行得到的结果显示:2008年的平均降水入渗量为56.27 mm,比2000年的值高。利用降水入渗系数法进行计算,也得到了2008年的降水入渗量高于2000年的结果,这与SWAT模型模拟得到的结果有着相同的趋势,且平均降水入渗量的标准偏差为5.27,说明SWAT模型对于研究区有良好的适应性。同时,根据土地利用数据和SWAT模型模拟数据可以得知,LUCC对研究区的降水入渗量存在着一定的相关性。

Precipitation infiltration was simulated by SWAT model in Da＇an city of Jilin province,a semi-arid area with serious salinization. Data of land use in this study were from interpretations of remote sensing images in 2000,2004 and 2008. Combined with the analogue value of SWAT,correlativity between LUCC and precipitation infiltration was discussed. Compared with 2000,area of land hard to utilize in 2008 decreased,and area of dry land and grass land increased. So,it was a good trend of land status in the studied area. In 2008,average precipitation infiltration simulated by SWAT model was 56. 27 mm,higher than that in 2000. With the value calculated by precipitation infiltration coefficient,the result of precipitation infiltration in 2008 was higher than that in 2000. It showed the same trend as simulation with the standard deviation was 5. 27. It could be concluded that SWAT model was in good adaptability in the studied area. Meanwhile,in accordance with data of land use and analogue value,there was a certain correlation between LUCC and precipitation infiltration.