| 云梦泽与荆江三角洲的历史变迁 |
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| 引用本文： | 周凤琴.云梦泽与荆江三角洲的历史变迁[J].湖泊科学,1994,6(1):22-32. |
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| 作者姓名： | 周凤琴 |
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| 作者单位： | 水利部长江水利委员会荆江河床实验站 沙市434002 |
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| 摘 要： | 本文通过对大量地质地貌、考古和文史资料的综合考证与分析,讨论了(1)云梦泽的形成、范围与兴衰历史;(2)荆江三角洲变迁的过程、阶段与特征;(3)荆江三角洲与洪涝灾害;(4)江湖历史变迁与问题思考等。
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| 关 键 词： | 云梦泽 荆江三角洲 历史变迁 |
| 收稿时间： | 1992/3/16 0:00:00 |
| 修稿时间： | 5/5/1993 12:00:00 AM |
Historical evolution of Yunmeng marsh and Jingjiang Delta |
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| Zhou Fengqing.Historical evolution of Yunmeng marsh and Jingjiang Delta[J].Journal of Lake Science,1994,6(1):22-32. |
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| Authors: | Zhou Fengqing |
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| Institution: | Jing jiang River-bed Expertmental Station, Water Resources Committee of Chang Jiang River, shashi 434002 |
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| Abstract: | On the basis of comprehensive research on the information of geology, geomorphology, channel hydrography, meteorology, historical documents and archaeology of Yunmeng Marsh and Jingjiang Delta, some conclusions are obtained as follows: (1) The Yunmeng Marsh was formed at the end of late pleistocene ice age, when the sea level was declining draniatically resulting in the cutdown of the river-bed of the Changjiang River.As the climate went warmer in the postglacial stage, the gradual rise of sea ievel made the gradient of the Changjiang River more gentle, the sedinientation against the stream took place and the river level began to rise.When the flood breached the bank after the original channel was mandated, the Yunmeng Marsh was formed in the Jingjiang River (middle reach of the Changjiang River) area.The early marsh limited mainly in the abandoned river valley, when constant deposits in the Changjiang River accumulated 0n the lower lands, the marsh was enlarged.The marsh was vast with lands and shallow water interlocked, including the areas of Changjiang River, Hanshui River and part of the Dong ring Lake, (2) The Jingjiang Delta experienced three changes in history;the delta was a part of the developing Yunmeng marsh till Tang and Song dynasties;of the developing Jingjiang bend plain till the end of Qing Dynasty;of the developing Dong ting.Lake delta since the early 19th century.It was concluded that the migration of the Jingjiang Delta showed sume gradient southward.(3) The evolution of the Jingjiang Delta has proved some characteristics of stages.The early delta was thin due to plane accretion on a big area.while later vertical accretion along the diversion channels increased its thick ness.The depocemer position of sediments was the main factor affecting the delta's evolution.urhers were the neutectonic muvement and human activities such as dike building, etc.(1) The developmein and migraduii of Jingjiang Delta in history led Co the dramacic rising of flood level in Dungting Lake and Jianghan plains.Beginning from Pleistocene, the first rising period was from pustglacier age tu some 5000 years ago while the second in the late Ming or early Qing dynasties. Nowadays because of many discharge diversions of the Changjiang River, a great quantity of sediniems depusited to the south of Dungting Lake,the lake bed rose ajid the surface area shrank gradually.Were some programs and counter-measures not employed.the third rising period of fluucl level would Come to reality in no time,which would make the flood control of the two lake plains more difficult to deal with. |
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| Keywords: | Yunmeng Marsh Jingjiang Delta plane accretion vertical accretion longtidutional section of river historical evolution |
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