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Bank erosion processes along the lower Mekong River

Bank erosion processes along the lower Mekong River
Bank erosion processes along the lower Mekong River
This project conducts an analysis of bank erosion processes on a large, monsoonaffected river, the Lower Mekong River in Laos. The methodological approach taken was to build integrated models of bank erosion processes at three study sites on the Lower Mekong River in Laos (Friendship Bridge, Ang Nyay and Pakse) to simulate processes of (i) groundwater seepage and pore water pressure evolution, (ii) the effect of this on mass-wasting (using the Geo-slope model) and, (iii) fluvial erosion (using a model adapted from Kean and Smith, 2006ab). In all cases the models were parameterised using measured bank geotechnical properties. Across the study sites, a total of 42 simulations were undertaken to represent a wide range of observed flow events. Specifically, 14 selected flow hydrographs (comprising three types: single peak, multiple peak and rapid fall) were evaluated at each of the study sites, such that the influence on bank erosion of the hydrological properties of different monsoon floods could be evaluated. The main findings indicate that although the Mekong is a big river, its dominant bank erosion process is one of slow, gradual, fluvial erosion. This research forms a partial contribution to understanding bank erosion processes operating in the Mekong. It was found that bank stability on the Mekong responses to variations in flood magnitude in ways that are similar to other rivers located within humid temperate areas. However, the Mekong has had the greater stability than these rivers due to its greater bank heights and more consolidated bank materials.
Trieu, Hai Q.
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Trieu, Hai Q.
a636dc48-e2ae-4224-b1df-93128ee6d633
Darby, Stephen
4c3e1c76-d404-4ff3-86f8-84e42fbb7970
Carling, Paul
8d252dd9-3c88-4803-81cc-c2ec4c6fa687

(2012) Bank erosion processes along the lower Mekong River. University of Southampton, Geography and Environment, Doctoral Thesis, 177pp.

Record type: Thesis (Doctoral)

Abstract

This project conducts an analysis of bank erosion processes on a large, monsoonaffected river, the Lower Mekong River in Laos. The methodological approach taken was to build integrated models of bank erosion processes at three study sites on the Lower Mekong River in Laos (Friendship Bridge, Ang Nyay and Pakse) to simulate processes of (i) groundwater seepage and pore water pressure evolution, (ii) the effect of this on mass-wasting (using the Geo-slope model) and, (iii) fluvial erosion (using a model adapted from Kean and Smith, 2006ab). In all cases the models were parameterised using measured bank geotechnical properties. Across the study sites, a total of 42 simulations were undertaken to represent a wide range of observed flow events. Specifically, 14 selected flow hydrographs (comprising three types: single peak, multiple peak and rapid fall) were evaluated at each of the study sites, such that the influence on bank erosion of the hydrological properties of different monsoon floods could be evaluated. The main findings indicate that although the Mekong is a big river, its dominant bank erosion process is one of slow, gradual, fluvial erosion. This research forms a partial contribution to understanding bank erosion processes operating in the Mekong. It was found that bank stability on the Mekong responses to variations in flood magnitude in ways that are similar to other rivers located within humid temperate areas. However, the Mekong has had the greater stability than these rivers due to its greater bank heights and more consolidated bank materials.

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More information

Published date: April 2012
Organisations: University of Southampton, Geography & Environment

Identifiers

Local EPrints ID: 340011
URI: http://eprints.soton.ac.uk/id/eprint/340011
PURE UUID: 4aff3e2d-1869-4dc6-92fe-ac61979de0ff
ORCID for Stephen Darby: ORCID iD orcid.org/0000-0001-8778-4394

Catalogue record

Date deposited: 13 Aug 2012 10:22
Last modified: 06 Jun 2018 12:58

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Contributors

Author: Hai Q. Trieu
Thesis advisor: Stephen Darby ORCID iD
Thesis advisor: Paul Carling

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