Analysis of dynamic change of Hongjiannao Lake based on MNDWI

Abstract

In order to understand recent changes in inter-annual trends in water area of Hongjiannao Lake and to explore influence factors affecting the changes, the Landsat data during the year from 1988 to 2014 was processed by Modified Normalized Difference Water Index (MNDWI) and the water body boundary of Hongjiannao Lake was extracted. Then the water area was calculated in ARCGIS, and also the variation was analysed. The results show that the water area of Hongjiannao Lake is overall decreasing from 1988 to 2014. The possible causes of its shrinking by preliminary analysis are mainly continuous underground mining, climate drought, upstream reservoirs and so on.