MAPPING AND MONITORING EROSION-ACCRETION IN AN ALLUVIAL RIVER USING SATELLITE IMAGERY - THE RIVER BANK CHANGES OF THE PADMA RIVER IN BANGLADESH
MAPPING AND MONITORING EROSION-ACCRETION IN AN ALLUVIAL RIVER USING SATELLITE IMAGERY - THE RIVER BANK CHANGES OF THE PADMA RIVER IN BANGLADESH
复制标题
DOI：
10.2478/quageo-2018-0027
复制
发表时间：
2018-09-01
影响因子：
1
通讯作者：
Billah, Mohammad Maruf
中科院分区：
文献类型：
--
作者：
Billah, Mohammad Maruf
帕德玛河以其动态和灾难性的行为而闻名，河流经历了强烈而频繁的河岸侵蚀和沉积，导致了河岸的变化和移动。本文利用1975-2015年Landsat卫星影像MSS、TM、OLI和TIRS影像的时间序列，对研究时段的河岸侵蚀增积和岸线移动进行了检测。这项研究表明，帕德玛河沿岸的土地侵蚀和增积急剧增加。结果表明：1975 - 2015年，河滩侵蚀总量为49951 ha，侵蚀速率为1249 ha a(-1)；河滩侵蚀总量为83333 ha，侵蚀速率为2083 ha a(-1)；在整个监测期内，河流右段侵蚀增积更为明显，岸线呈南移趋势。岛屿总面积明显增加，从1975年的20,533 ha增加到2015年的约50,967 ha，结果表明河床沉积具有一致性。
The Padma river is widely known for its dynamic and disastrous behaviour, and the river has been experiencing intense and frequent bank erosion and deposition leading to the changes and shifting of bank line. In this paper, a time series of Landsat satellite imagery MSS, TM and OLI and TIRS images and are used to detect river bank erosion-accretion and bank line shifting during the study period 1975-2015. This study exhibits a drastic increase of erosion and accretion of land along the Padma river. The results show that from 1975 to 2015, the total amount of river bank erosion is 49,951 ha of land, at a rate of 1,249 ha a(-1) and the total amount of accretion is 83,333 ha of land, at a rate of 2,083 ha a(-1). Throughout the monitoring period, erosion-accretion was more pronounced in the right part of the river and bank line had been shifting towards the southern direction. The paper also reveals that the total area of islands had been increased significantly, in 2015 there was about 50,967 ha of island area increased from 20,533 ha of island area in 1975, and the results evidence consistency of sedimentation in the river bed.