Geographical review of Japan series B
Online ISSN : 1883-4396
ISSN-L : 1883-4396
Article of the Special Issue on “Environment Evolution and Human Activity in the Late Quaternary: Geographical Pattern”
Fluvial Geomorphology and Characteristics of Modern Channel Bars in the Lower Stung Sen River, Cambodia
NAGUMO NaokoSUGAI ToshihikoKUBO Sumiko
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2015 Volume 87 Issue 2 Pages 115-121

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Abstract

Tributaries of Lake Tonle Sap in the Lower Mekong Basin are strongly influenced by seasonal changes of water level in Lake Tonle Sap and discharge of the Mekong River. The aim of this research was to gain a better understanding of the fluvial geomorphology of the Stung Sen River, a tributary of Lake Tonle Sap. We used stereopairs of aerial photographs and satellite images to identify the microtopography of the floodplain and riverbed, and field surveys to observe bankside topography and deposits. We recognized four types of channel bar in the lower Stung Seng River: lateral bars (type A), point bars (type B), concave-bank benches (type C), and diagonal and island bars (type D). Type A appears to have a complementary relationship with type D. In some instances types A and D bars transition to type B bars and, in rare instances, into type C bars. These changes are probably related to channel sinuosity and changes in the volume of transported sediment. Sediment transport and construction of the channel bars appears to be controlled by shifts of the flow regime of the Stung Sen River related to differences in the rate of water level rise in the river compared to those in Lake Tonle Sap. The riverine environment differs greatly from that of the floodplain, where sediment is deposited from suspension during periods of inundation.

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© 2015 The Association of Japanese Geographers
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