Application of remote sensing to assess changes in shoreline and level of riverbed under the pressure of sand mining activities

In 2010, about 11 billion tons of sand was used for construction in global; Vietnam is among the top ten sand producing countries. Sand mining has a significant impact on morphological characteristics, such as the degradation of the canal bed, erosion of the riverbank and the change in the shape of the river. In this paper, the monitoring of shoreline change on the riverbank is conducted in Krong No river belonging Dak Nong province. In details, remote sensing method is applied to determine main erosion locations and development of erosion distance by years by observing shoreline change in 2014-2018. The result shows that over the five years, the total erosion area on the right of riverbank (288.414 m2) is twice as large as the left side (118.730 m2). Moreover, 83.26 meters is the largest erosion distance. Duc Xuyen - Dak Nang communes are the most affected area by erosion. The article also discusses the simulation results of riverbed change. It shows that under pressure from the extraction of sand the riverbed is impacted, some points prone to erosion. Therefore, it raises a concern about sustainability with regard to the exploitation of sand and recommend that the local authority should define the maximum exploitable capacity to ensure that sand mining is conducted in a responsible manner for the future. � 2020 40th Asian Conference on Remote Sensing, ACRS 2019: "Progress of Remote Sensing Technology for Smart Future". All rights reserved.