Research on Geomorphological Features and Floods in the Lower Mekong Plain in Cambodia

本研究旨在阐明柬埔寨湄公河下游平原的地貌和洪水特征，20世纪后期的政治状况使得研究该地区直到最近才变得困难。二零零一年完成地形图、航空照片和卫星图像的收集和判读工作。2002年进行了金边周围的地貌测绘，并检查了微地貌与洪水之间的关系。2003年，继续进行湄公河下游平原的地貌测绘、平原地下地质调查和近20年的卫星影像洪水调查。天然堤坝和后沼泽在湄公河平原下游很常见。洪泛特征因平原微地貌和地貌特征而异。地下地质研究表明，北部基底岩发育在浅层，南部为峡谷埋有冲积层。这些结果为了解湄公河下游平原的地貌和沉积物提供了基础。

This study aims to clarify geomorphologic and flood features of the Lower Mekong River Plain in Cambodia, where the political condition in the late 20th century made it difficult to study the area till very recent.Collection and interpretation of topographic maps, aerial photographs and sattelite images were done in 2001. Geomorphological mapping around Phnom Penh and examination of relationships between micro-land forms and inundation were carried in 2002. In 2003, Geomorphological mapping in the Lower Mekong Plain, investigation of subsurface geology of the plain, and examination of floods in the last two decades by satellite images were continued.Natural levees and back marshes are common in the Lower Mekong Plain. Flooding characters varied by these micro land forms and geomorphic features of the plain. Study in subsurface geology suggested that base rock occurs in shallow parts in the Northern part, while a valley is buried with alluvial deposits in the Southern part.These results provide basic understanding of land forms and deposits of the Lower Mekong Plain.