MODIS遥感数据辅助的鄱阳湖水体范围变化数值模拟

Hydrodynamic Simulation of Water Extend Change in Poyang Lake with Aid of MODIS Remote Sensing Data

针对水体范围高动态变化的鄱阳湖,充分发挥数值模拟和遥感各自的优势,使用从MODIS影像上提取的水体范围初始化鄱阳湖水体范围数值模拟边界和率定模型参数,并与模拟的水体范围结果进行交叉验证分析。对鄱阳湖2001-07-08～11-30水体范围动态变化数值模拟的结果显示,水位模拟平均绝对误差小于15cm,数值模拟获取的水体范围与MODIS无云影像提取的湖泊水体范围具有较高的一致性,水体面积平均相对误差为5.7%。

Taking Poyang Lake as an example,numerical simulation and remote sensing are fully taken advantage of to monitor the water extend change.Water extend extracted from MODIS images is used to initialize numerical simulation boundaries of water body and calibrate simulation parameters,and also used to be compared with the simulated water extend.With this method,the water extend dynamic change of Poyang Lake from July 8,2001 to November 30,2001 is simulated.Results show that the average absolute error of simulated water level is less than 15 cm.Water extend of numerical simulated and extracted from the MODIS cloud-free images have a good agreement,and the average relative error of water area is 5.7%.This study shows that by making use of satellite remote sensing data,precision of water extend hydrodynamic numerical simulation of the Poyang Lake can be increased.This method can make up for the deficiency of water dynamic monitoring by optical remote sensing in bad weather conditions,thus providing a powerful technique support for water environment monitoring of lakes.