黄土高原重要水库水位变化的ICESat/GLA14监测

为了基于ICESat/GLA14测高数据对黄土高原重要水库水位变化进行动态监测,该文首先利用Landsat 8遥感影像提取黄土高原的水体边界,并参考ICESat/GLA14数据的分布状况在黄土高原东部选取了册田水库,中部选取了文峪河和王窑水库,西部选取了刘家峡、寺口子和沈家河水库;然后以10cm为阈值对ICESat/GLA14数据进行筛选,从而获得了所选水库水位长时间序列的动态变化;最后将册田和文峪河水库的ICESat/GLA14测量水位与实测水位进行比较,验证ICESat/GLA14监测水库水位变化的准确性。研究结果表明:东部水库水位呈明显下降趋势;中部水库水位在2005年5月明显下降,其后逐渐恢复,整体呈下降趋势;西部水库水位变化不大;ICESat/GLA14测量的水库水位变化与实测水位变化基本一致。

Water level changes monitoring of important reservoirs in Loess Plateau based on ICESat/GLA14

In order to dynamically monitor the water level change of important reservoirs in Loess Plat eau based on ICESat/GLA14 altimetry data,firstly,Landsat 8 remote sensing image was utilized to extract the water boundary of Loess Plateau,and the Cetian reservoir of eastern,the Wenyu River and Wangyao reservoirs of central,the Liujiaxia,Sikouzi and Shenjiahe reservoirs of western Loess Plateau were selected referencing the distribution of ICESat/GLA14 data;Then,the ICESat/GLA14 data was filtered by the threshold of 10 cm,thereby gaining the dynamic changes of long time series of water level in the reservoirs selected;Finally,the water level derived from ICESat/GLA14 of Cetian and Wenyu River reservoirs was compared with the measured water level to verify the accuracy of ICESat/GLA14 monitoring reservoir water level changes.The research results showed that the water level of reservoir in the east dropped significantly;the water level of reservoirs in the central decreased dramatically in May 2005 followed by gradual recovery,the overall showed a downward trend;the changes of water level of reservoirs in the west were not obvious;The reservoir water level changes of ICESat/GLA14 measurement is basically consistent with the measured water level changes.