TY - JOUR
T1 - Fluvial geomorphology and characteristics of modern channel bars in the lower stung sen river, Cambodia
AU - Nagumo, Naoko
AU - Sugai, Toshihiko
AU - Kubo, Sumiko
N1 - Funding Information:
This research was financially supported by a Sasakawa Scientific Research Grant from the Japan Science Society (No. 21-624) and a Grant-in-Aid for Scientific Research from the Japanese Ministry of Education, Culture, Sports, Science and Technology (No. 21401004). We thank the members of the Sambor Prei Kuk Conservation Project for their help during our field survey. Part of this research was presented at the International Geographical Union Kyoto Regional Conference in 2013 and at the Japan Geo-science Union Meeting in 2014.
Funding Information:
This research was financially supported by a Sasakawa Scientific Research Grant from the Japan Science Society (No. 21-624) and a Grant-in-Aid for Scientific Research from the Japanese Ministry of Education, Culture, Sports, Science and Technology (No. 21401004). We thank the members of the Sambor Prei Kuk Conservation Project for their help during our field survey. Part of this research was presented at the International Geographical Union Kyoto Regional Conference in 2013 and at the Japan Geoscience Union Meeting in 2014.
Publisher Copyright:
© 2015 The Association of Japanese Geographers.
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
KW - Channel migration
KW - Lake Tonle Sap
KW - Microtopography
KW - River bed
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U2 - 10.4157/geogrevjapanb.87.115
DO - 10.4157/geogrevjapanb.87.115
M3 - Article
AN - SCOPUS:85031762440
VL - 87
SP - 115
EP - 121
JO - Chirigaku Hyoron/Geographical Review of Japan
JF - Chirigaku Hyoron/Geographical Review of Japan
SN - 0289-6001
IS - 2
ER -