基于高分辨率遥感影像的荆江河段南部洪道崩岸监测——以戥盘洲弯道为例

Monitoring of flood channel bank collapse in the southern section of the Jingjiang River based on high-resolution remote sensing images:taking the Dengpanzhou bend as an example

为研究长江支流崩岸情况,本文以荆江河段南部松滋河戥盘洲弯道及江心洲为例,利用高分辨率遥感影像数据,采用定量描述的方法,对其2013—2022年崩岸情况进行监测。监测结果表明,河道和江心洲都存在不同程度的崩岸,其中监测点南部河道宽度由2013年4月的203.11 m扩宽至2022年11月的287.94 m,平均每年扩宽8.5 m,每月扩宽0.74 m。5个监测点在监测期内都有不同程度的崩岸,崩岸程度最严重的监测点至河道岸边的距离从2013年4月的122.56 m缩短至2022年11月的60.13 m,平均每月缩短达0.54 m。因此,利用高分辨率遥感影像开展崩岸监测是一种非常有效的监测手段,是常规监测的有益补充;建议在开展长江主干流崩岸监测和修建防护工程的同时,应加强对长江支流河道崩岸的监测和河道防护。

To study the situation of bank collapse in the Yangtze River tributary,high-resolution remote sensing image data and a quantitative description method was used to analyze the Songzi River in the southern part of the Jingjiang River section,Taking Dengpanzhou Bend and Jiangxinzhou as examples,monitoring the bank collapse situation from 2013 to 2022.Monitoring shows that there are varying degrees of bank collapses in both the river channel and the Jiangxinzhou.The width of the southern river channel at the monitoring point increased from 203.11 meters in April 2013 to 287.94 meters in November 2022,with an average annual expansion of 8.5 meters and a monthly expansion of 0.74 meters.During the monitoring period,all five monitoring points experienced varying degrees of bank collapse.The distance from the most severe monitoring point to the riverbank decreased from 122.56 meters in April 2013 to 60.13 meters in November 2022.The results indicate that using high-resolution remote sensing images for monitoring bank collapse is a very effective monitoring method and a beneficial supplement to conventional monitoring;It is recommended to strengthen the monitoring and protection of riverbank collapses in the Yangtze River tributaries while carrying out monitoring and construction of protection projects for the main stream of the Yangtze River.