Fluvial geomorphology and characteristics of modern channel bars in the lower stung sen river, Cambodia

Naoko Nagumo, Toshihiko Sugai, Sumiko Kubo

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)115-121
    Number of pages7
    JournalGeographical Review of Japan
    Volume87
    Issue number2
    DOIs
    Publication statusPublished - 2015 Jan 1

    Fingerprint

    fluvial geomorphology
    Cambodia
    river
    lake
    water
    floodplain
    tributary
    water level
    bank
    microtopography
    geography
    aerial photograph
    sediment
    field survey
    sediment transport
    topography

    Keywords

    • Channel migration
    • Lake Tonle Sap
    • Microtopography
    • River bed

    ASJC Scopus subject areas

    • Geography, Planning and Development
    • Earth-Surface Processes

    Cite this

    Fluvial geomorphology and characteristics of modern channel bars in the lower stung sen river, Cambodia. / Nagumo, Naoko; Sugai, Toshihiko; Kubo, Sumiko.

    In: Geographical Review of Japan, Vol. 87, No. 2, 01.01.2015, p. 115-121.

    Research output: Contribution to journalArticle

    @article{f2c9b657965c4ea1a38287565853a849,
    title = "Fluvial geomorphology and characteristics of modern channel bars in the lower stung sen river, Cambodia",
    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.",
    keywords = "Channel migration, Lake Tonle Sap, Microtopography, River bed",
    author = "Naoko Nagumo and Toshihiko Sugai and Sumiko Kubo",
    year = "2015",
    month = "1",
    day = "1",
    doi = "10.4157/geogrevjapanb.87.115",
    language = "English",
    volume = "87",
    pages = "115--121",
    journal = "Chirigaku Hyoron/Geographical Review of Japan",
    issn = "0289-6001",
    publisher = "Association of Japanese Geographers",
    number = "2",

    }

    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

    PY - 2015/1/1

    Y1 - 2015/1/1

    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

    UR - http://www.scopus.com/inward/record.url?scp=85031762440&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85031762440&partnerID=8YFLogxK

    U2 - 10.4157/geogrevjapanb.87.115

    DO - 10.4157/geogrevjapanb.87.115

    M3 - Article

    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 -