陈子琪 陈亮 李建松

摘 要：及时发现河湖岸线水事活动对监管河湖岸线、维护河湖健康具有重要意义。选取黄河小北干流4期Radarsat-2遥感影像形成2期干涉像对，对干涉数据进行数据预处理生成相干系数图。利用地物的干涉相干特性，采用差值阈值法获取河湖岸线水事活动疑似“热点”图斑，以同期高分辨率可见光遥感影像为验证数据对结果进行验证和分析。结果表明，基于相干系数变化可以成功发现河道临河房屋建设、堆放、占用等水事活动，利用该方法进行河道水事活动监测是可行的。

关键词：相干系数;水事活动;InSAR;发现监测;河湖岸线

中图分类号：TP79   文献标志码：A

doi：10.3969/j.issn.1000-1379.2020.07.035

Abstract：Water matter activity monitoring is of great significance for river and lake shoreline supervision and maintenance of river and lake health. Four radarsat-2 remote sensing images of Xiaobeiganliu reach of the Yellow River were chosen to form phase 2 interference image pairs. Coherence coefficient difference maps were generated through data preprocessing of the interference images. Based on the coherence characteristics of the ground object in InSAR images， the suspected “hot spot” pattern of water matter activity in the river and lake shoreline were obtained by the threshold method. The monitoring results were verified by the high-resolution visible remote sensing image of the same period. The results show that the methods based on the change of coherence coefficient is feasible and effective to find water matter activity of river and lake shoreline such as house construction， stacking and occupation.

Key words： coherent coefficient; water matter activity; InSAR; monitoring; river and lake shoreline

1 引 言

河湖水系是水资源的重要载体，在防洪、供水、灌溉、发电、航运、生态等方面具有不可替代的作用。长期以来，河湖岸线是新老水问题最为集中的区域，违规建设开发、围垦河湖、侵占河道、违法养殖、非法采砂等水事活动频发，河道和湖泊面积萎缩、水域空间减小、水质恶化、生物栖息地破坏等问题十分突出，严重影响了河湖健康。2016年和2017年中共中央办公厅、国务院办公厅先后印发了《关于全面推行河长制的意见》和《关于在湖泊实施湖长制的指导意见》，在全国江河湖泊全面推行河湖长制，为维护河湖健康生命、实现河湖功能永续利用提供了制度保障。在全国范围内开展的河湖清“四乱”专项行动是推动河长制从“有名”向“有实”转变的第一抓手，是水利行业强监管的重要内容，是对各级河长、湖长和水行政主管部门履职尽责的底线要求。……