Abstract
Abstract. In this study, a method for developing a quantitative prediction of river bank erosion in Bien Hoa district in Dong Nai River is presented. The river bank erosion hazard index (BEHI) was estimated to assess the stability of the river bank erosion in consultation with bank height, bank slope, rooting depth, rooting density and surface protection. The estimated BEHI of Dong Nai River in Bien Hoa district are high which indicates the riverbank instability. The estimated BEHI along the left bank is about 25–30. The satellite data of LANSAT TM 5, LANDSAT ETM 7 for the year 1995, 2005 and 2015 were used to assess the nature of shifting of the river bank and to estimate the land loss from river bank. All the derived images were transported on GIS environment to extract the course of the river. 13 sites were considered along the Dong Nai River in Bien Hoa District to estimate the leftward shifting of the bank line and to assess the shifting distance of the river bank line. There is a strong relationship between bank instability BEHI, shifting distance of the bank line and eroded bank area in this study.
Highlights
Riverbank erosion is one of the most severe phenomenon in the rural area of Vietnam, including Dong Nai province
There are many methods of assessing riverbank erosion, one of which is the method of using the Bank Erosion Hazard Index
Stream bank assessment includes the measurements of bank heights, angles, materials, presence of layers, rooting depth, rooting density and percentage of bank protection which are used to develop the Bank Erosion Hazard Index (BEHI)
Summary
Riverbank erosion is one of the most severe phenomenon in the rural area of Vietnam, including Dong Nai province. The natural disaster has a negative impact on people’s life and community’s activity. There are many methods of assessing riverbank erosion, one of which is the method of using the Bank Erosion Hazard Index. Stream bank assessment includes the measurements of bank heights, angles, materials, presence of layers, rooting depth, rooting density and percentage of bank protection which are used to develop the Bank Erosion Hazard Index (BEHI). BEHI was estimated after Rosgen (2001a and 2001b) to assess the nature of credibility of the river bank in Manikchak. The BEHI methodology evaluates a stream bank’s susceptibility to erosion as a function of five factors, including: 1. The BEHI methodology evaluates a stream bank’s susceptibility to erosion as a function of five factors, including: 1. The ratio of stream bank height to bank full stage
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