论文部分内容阅读
一、区域自然地理背景 洞庭盆地位于荆江南岸,跨湘鄂两省,总面积18,780km~2,周围群山环抱,中央为辽阔的冲积平原。自湖盆周围向中心地带,低山、丘陵、阶地、平原呈层状分布,逐级降低,明显地可分为三至四级。盆地中心则为多级阶地和50m以下的冲积平原。这里河湖密布、堤垸交错、地势低平,主要是长江及其支流湘、资、沅、澧诸水形成的泛滥平原。整个盆地的
I. Regional Natural Geography Background The Dongting Basin is located on the south bank of the Jingjiang River. It covers a total area of 18,780km ~ 2 and is surrounded by mountains. The central part is a vast alluvial plain. Since the lake basin to the center, low mountains, hills, terraces, plains are layered distribution, gradually reduced, apparently can be divided into three to four. The basin center is multi-level terraces and alluvial plains below 50m. The rivers and lakes are densely covered, the embankments are staggered and the terrain is low, mainly due to the flood plains formed by the Yangtze River and its tributaries, such as Xiang, Ziyuan and Yuan Rivers. The whole basin