鄱阳湖面积的卫星遥感估计及其与水位关系分析

鄱阳湖水位变幅巨大,近年来旱涝灾害严重,对其进行实时监测具有重要意义。MODIS遥感数据时间分辨率很高,在水体动态监测中具有明显优势。水体提取方法多种多样,在比较不同水体提取方法的基础上,最终选用改进的归一化水体指数(MNDWI)的方法进行鄱阳湖水体提取;利用2000~2010年40期MODIS数据分析了鄱阳湖这10 a的水面面积年际演变特征及季节性变化特征,同时结合同时期的水位数据,建立了鄱阳湖面积-水位关系的模型。与地形图量测结果的对比表明,遥感解译的鄱阳湖水体面积-水位关系与根据地形图分析建立的面积-水位关系具有较好的一致性。

Estimate the Area of the Poyang Lake Using Satellite Remote Sensing Data and Analyze Its Relationship with Water Level

The water level amplitude of Poyang Lake changes greatly lead to severe drought and flood disaster.It is of great significance to real-time monitoring water body.Using MODIS remote sensing data to water dynamic monitoring brings obvious advantages since it has high temporal resolution.Water extraction method varied,and the improved normalization water index (MNDWI) method is chosen for Poyang lakes water dynamic monitoring after comparing the different water extraction methods.We establish the area-water level quadratic function model by utilizing 40 phase of MODIS data from 2000 to 2010 to study the evolutionary process of Poyang Lake in these ten years and simultaneously by combining the water level data of this period.With the measured data validation,the area-water level relation by interpretation of remote sensing has a good consistency with that established by topographic analysis,which provids effective measures for hydrological features analysis of Poyang Lake and the basis for flood control and drought resistance.