“5.22”玛多地震影响区水体变化遥感探测  

Remote Sensing Detection of Water Changes in the“5.22”Maduo Earthquake Impact Area

作　　者：钟宇茜 夏兴生 胡天宇 潘耀忠 ZHONG Yuxi;XIA Xingsheng;HU Tianyu;PAN Yaozhong(Academy of Plateau Science and Sustainability,Qinghai Normal University,Xining 810016,China;State Key Laboratory of Remote Sensing Science,Beijing Normal University,Beijing 100875,China;School of Geographical Sciences,Qinghai Normal University,Xining 810016,China)

机构地区：[1]青海师范大学高原科学与可持续发展研究院,西宁810016 [2]北京师范大学地理科学学部遥感科学国家重点实验室,北京100875 [3]青海师范大学地理科学学院,西宁810016

出　　处：《航天返回与遥感》2023年第4期125-142,共18页Spacecraft Recovery & Remote Sensing

基　　金：国家自然科学基金项目(42201027,42192581);第二次青藏高原综合科学考察研究(2019QZKK0906,2019QZKK0603)。

摘　　要：对地质活动主要影响区水系、水体变化进行监测,对于探索地质活动对区域自然和社会系统的影响具有重要意义。本文在GoogleEarthEngine平台的支持下,基于2018—2021年逐年7—11月的Sentinel-2A/B遥感数据,通过构建水体指数并利用大津算法对“5.22”玛多地震影响区水体信息进行提取并探测其变化情况。主要结果如下:(1)基于Sentinel-2A/B遥感数据构建的8种水体指数中B3和B5波段组合指数水体信息提取最优,为水体指数构建的波段选择提供了新的参考;(2)对玛多地震前后水体变化进行探测发现2018—2021年研究区水体不存在新增与消失,仅有扩张或收缩,且地表水体面积总体上呈先扩张后收缩的趋势。但是,对局部水体来说,并不完全遵循这一规律;(3)气候变化并不能很好地解释局部水体的变化规律,结合区地震影响区域现场调查的事实证明地震活动确实造成了部分地表水体的变化。It is of great significance to monitor the changes of water systems and water bodies in the area mainly affected by geological activities for exploring the influence of geological activities on regional nature and society systems.With the support of the Google Earth Engine platform,based on the Sentinel-2A/B remote sensing data from July to November in 2018-2021,this paper constructed water index,which was used the OTSU algorithm to extract the water information,and detect its changes in the affected area of"5.22"Maduo earthquake.The main research results are as follows:(1)Among the eight kinds of water indexes constructed based on Sentinel-2A/B remote sensing data,the water index constructed by the combination of B3 and B5 has the best extraction result for water information,which provides a new reference for the selection of band for water index construction.(2)The changes of water bodies before and after the Maduo earthquakes were detected,and it was found that the water bodies in the study area did not increase or disappear from 2018 to 2021,only expanded or contracted.And the surface water area generally expanded first and then contracted.However,for local water bodies,this law is not completely followed.(3)Climate change cannot explain the change law of local water bodies very well.Combined with the fact of field investigation in the earthquake-affected area,it is confirmed that seismic activity did cause the change of surface water bodies.

关 键 词：水体指数 大津算法 气候变化 地质活动 多光谱传感器 

分 类 号：N37[自然科学总论] N39