The Stung Sen River is a major tributary of the Tonle Sap River systems, and several pre-Angkor strongholds are located in its drainage basin. Geomorphological characteristics and development of floodplain in lower reach of the Stung Sen River is discussed by sedimentary core analysis and field survey. The floodplain is composed of more than 10 m of fluvial deposits which overlay the heavily weathered basement. Five depositional units and alternation of sandy channel deposits and suspended deposits are distinguished. The accumulation rate of the successive floodplain deposits is calculated as 0.1-0.6 mm/yr by AMS-14C ages, while the rate near the Stung Sen main channel is large, to be replaced frequently by the channel shifts. Fluctuation in the groundwater level is shown by the deposits color. This represents distinct seasonal environmental changes caused by monsoon.
|ジャーナル||Chikei/Transactions, Japanese Geomorphological Union|
|出版ステータス||Published - 2011 4 25|
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