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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。
According to the hot research in recent years, SWAT model was used to simulate precipitation infiltration in the semi-arid and salinization area of Da’an, Jilin Province. Based on the land use data obtained from interpretation of remote sensing images in 2000, 2004 and 2008, the correlation between LUCC and precipitation infiltration was discussed based on the simulation results of SWAT model. Compared with 2000, the area of hard-to-use land decreased in 2008 and the area of dry land and grassland increased by a large area. The land condition in the study area improved somewhat. The results obtained through the SWAT model run show that the average rainfall infiltration in 2008 was 56.27 mm, higher than the value in 2000. Using the method of precipitation infiltration coefficient, we can get the result that precipitation infiltration in 2008 is higher than that in 2000, which has the same trend with SWAT model simulation, and the standard deviation of average precipitation infiltration is 5.27 , Indicating that the SWAT model has good adaptability to the study area. At the same time, according to the land use data and SWAT model simulation data, it can be learned that there is a certain correlation between LUCC and precipitation infiltration in the study area.