Bank erosion

About: Bank erosion is a research topic. Over the lifetime, 1631 publications have been published within this topic receiving 45579 citations. The topic is also known as: riverbank erosion.

Land Degradation Due to Jamuna Riverbank Erosion: A Case Study at Shahjadpur, Sirajganj District, Bangladesh

Abstract: Climate Change in Bangladesh is an extremely crucial issue. Bangladesh is one of the worstly affected countries by the impacts of Climate Change in coming decades. The climate change in Bangladesh causes the degradation of land resources. High intensity and recurrence of floods are due to irregular rainfall and glacier melting of the Himalayas intensified river bank erosion throughout the year. High yielding land resources on the river bank are degraded each year. This study was conducted for riverbank shifting detection, morphodynamics assessment, and estimation of eroded and accreted land by the Jamuna river at Shahjadpurupazila, Sirajganj district, Bangladesh. The investigation is based on multispectral satellite imagery interpretations using ArcGIS software, followed by a field check. Interpretations show that the Jamuna river in the study area has continuously shifted its path from east to west from 1956 to 2020, resulting in a total loss of 51.68 km2 of landmass. The rate of engulfment was 0.95km2/year whereas the accretion rate was 0.15km2/year. The maximum rate of river shifting on the right bank of Jamuna river in the ShahjadpurUpazila is 84.38 meters/year and the minimum shifting is 31.25 meters/year. This study will help to understand the scenario of land degradation by river erosion in the study area. It may be also helpful to the decision-makers to take the proper mitigation measures regarding riverbank erosion and protection.

Dendrogeomorphic possibilities for spatio-temporal reconstruction of the relationship between lateral river erosion and movements of destabilized river banks

Abstract: Destruction of river banks and gradual lateral fluvial erosion can be closely related processes. This study presents the potential of a unique combination of two dendrogeomorphological (tree-ring and root-ring based) approaches to reconstruct the intensity of lateral river erosion and reconstruct subsequent bank movements. The data on anatomical changes in exposed tree roots and the analysis of the tree-rings eccentricity in tilted trees on the bank allowed to reconstruct seven erosion events over the last 15 years and 17 bank movement events over the last ca. 70 years. The frequency of erosion events was higher compared to bank movement events and, in addition, they occurred in less extreme discharge years. This can be attributed to the high erodibility of the banks, whose sediments contain minimal amounts of clay (demonstrated by grain size analysis). On the contrary, bank movement events were less frequent but occurred almost exclusively during the most extreme flood years. Thus, bank destruction appears to occur after the critical value of bank undercutting by lateral fluvial erosion is exceeded. The findings suggest the possible use of tree rings as a potential indicator of an increased risk of bank destruction.