乌海湖库区河床裸露监测分析

Monitoring and Analysis of Riverbed Exposure in Wuhai Lake Reservoir Area

利用2015—2021年GF1号卫星遥感资料分析乌海湖库区河床裸露等级、裸露时段、裸露原因及临界条件。结果表明:(1)乌海湖库区河床裸露大致分为6级,0~5代表不同裸露程度,0级为零星裸露,5级为整个湖几乎全部裸露。(2)2018年及2018年之前河床裸露水位调整是主要原因;2018年之后出现裸露,水位和河床抬升是主要相关因素;目前裸露临界条件可每年根据河床和水位情况预测。(3)自乌海湖建成以来重点需要关注的裸露时段是每年11月—翌年3月。

Based on the remote sensing data of GF1 satellite from 2015 to 2021,the exposed grade,exposed period,exposed reason and critical conditions of riverbed in Wuhai lake reservoir area are analyzed.The results showed that:(1) the riverbed exposure in Wuhai lake reservoir area was roughly divided into 6 levels,0-5 represents different degrees of exposure,0 was sporadic exposure,and 5 was almost all exposure of the whole lake.(2) The adjustment of exposed river bed water level in 2018 and before 2018 was the main reason;Exposure occurs after 2018,and water level and riverbed uplift were the main relevant factors;At present,the exposed critical conditions could be predicted every year according to the riverbed and water level.(3) Since the completion of Wuhai lake,the key exposure period to be paid attention to was from November to march of the next year.