基于Landsat影像对太平湖水库面积变化的研究

Study on the Change of Taiping Lake Reservoir Area Based on Landsat Image

摘要: 能够快速、准确地从一幅遥感影像中获取想要进行研究所需的水体信息一直以来备受关注，是运用遥感来解决实际问题的一大热点。本文以Landsat 8卫星遥感影像作为主要的数据源，收集了2014年1月和2014年6月的Landsat 8 OLI_TIRS遥感影像，利用NDWI (归一化水体指数)和MNDWI (改进的归一化水体指数)两种指数方法进行运算，对太平湖水库主体水域面积进行提取，并分析水库面积的变化情况。太平湖水库地处皖南山区，由于季节变化的影响，水库面积也呈现出不一样的变化，通过对不同时间的Landsat影像应用两种方法对水库面积进行提取，研究发现水库面积处于动态变化之中，春夏梅雨季节相较于秋冬季节水库面积较大，而且研究发现MNDWI模型更加适合该地区水体信息的提取。最后本文将得到的水体面积信息进行合理分析，并对水库辖区及其下游居民的生产生活给出一些合理性的建议。

Abstract: The rapid and accurate acquisition of water information needed for research from a remote sensing image has always been a focus of great interest, and it is a major focus of using remote sensing to solve practical problems. Taking Landsat 8 remote sensing images as the main data source, this paper collected Landsat 8 OLI_TIRS remote sensing images in January 2014 and June 2014, extracted the Taiping Lake Reservoir main body water area by using NDWI and MNDWI water area analysis methods, and analyzed the change of the reservoir area. Taiping Lake Reservoir is located in the mountains in the south of Anhui. Because of the influence of seasonal change, the change in the reservoir area also shows a difference. Based on the Landsat images of different times, two methods were used to extract the reservoir area. The study found that the reservoir area of the dynamic, and spring-summer rainy season, compared with the autumn-winter season reservoir area, is larger. And the study discovered that the MNDWI model is more suitable for the extraction of water information in this area. Finally, this paper will make a reasonable analysis of the information obtained in the water area and give some reasonable suggestions for the production and life of the residents in the reservoir area and downstream.