云南洱海的环境沉积学研究──表层沉积物的粒度分布、水流方向和能量
- 1. 中国科学院地质研究所,北京 100029;
- 2. 云南省大理白族自治州城乡建设环保局,云南大理 671000;
- 3. 云南省大理白族自治州环境科学研究所,云南大理 671000
基金项目:
中国科学院广州地球化学所有机地球化学国家重点实验室基金
作者简介:
李原，男，1964年出生，博士后，生物地球化学及环境沉积学。
- 收稿日期:
1999-06-01
- 修回日期:
1999-07-13
- 刊出日期:
1999-12-10
摘要: 根据粒度分布特征、聚类分析和因子分析研究结果，推测洱海存在以下几种湖水流动特征：第一、弥直河水流，方向由北向南形成了洱海北区水流向南部的原水动力，其沉积物在北区形成大的弥直河三角洲；第二、由洱海西岸向东岸，入湖的溪流引起的辐射流，这种辐射流体现在太湖河流沉积物形成的扇三角洲上，沿西岸向湖心推进，在湖心和东岸被减缓；第三、存在沿西岸的南北向的湖水流动；第四、受水下地形影响，存在围绕湖心的环状流动，由粒度分布推测水流方向为反时针。它形成了现今表层沉积物粒度分布的主要格局，是多向多源水流共同作用的结果。
The Environment Sedimentol ogical Study on Erhal Lake,Yunnan Province——Sediments particl a size distribution,f1ow direction and energy distribution
- 1. Institute of Geology, Chinese Academy of Sciences,Dewai Street Beijing, 100029;
- 2. Urban Rural Constraction and Environment-protect Bareau of Dali Bei Nationality Automous Prefecture,Dali,Yunnan,P R China 671000;
- 3. Institute of Enviroment Science of Dali Bei Nationality Automous Prefecture,Dali,Yunnan,P R China 671000
- Received Date:
1999-06-01
- Rev Recd Date:
1999-07-13
- Publish Date:
1999-12-10
Abstract: The superficial sediment layer in lake,only a few centimeters in thickness,may contain more organic matter,nutrients and anthropogenic pollutants than the entire water-cdumn. The particle sige distribution can be used to indicate the flow direction and energy distribution of the lake. The water energy and flow's feature controlled the nutrients and pollutants distributions in the lake. In the light of research results about particle size distribution,cluster analysis and factor analysis,the author surmises that there are several types of lake flows with different direction and power existing in Erhai Lake.First,there is a flow from Miju River,which is the biggest input river of Erhai Lake,forming the primary dynamic flow. Second,the Cangshan streams along the western side of Lake Erhai forms the radical canal flows from west side to the east,which are diminished gradually,and built fan delta along west side.Third,along the west side,exists lake flows with the direction from north to south;fourth,affecting by the topography of Lake Erhai,there are three relatively big annular flows in Lake Erhai with anticyclone direction. In a word,the flows' features control nowadays size distribution framwork.
李原, 李任伟, 尚榆民, 李宁波. 云南洱海的环境沉积学研究──表层沉积物的粒度分布、水流方向和能量[J]. 沉积学报, 1999, 17(S1): 769-774.
| 引用本文: |
李原, 李任伟, 尚榆民, 李宁波. 云南洱海的环境沉积学研究──表层沉积物的粒度分布、水流方向和能量[J]. 沉积学报, 1999, 17(S1): 769-774.
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LI Yuan, LI Ren-wei, SHANG Yu-min, LI Ning-bo. The Environment Sedimentol ogical Study on Erhal Lake,Yunnan Province——Sediments particl a size distribution,f1ow direction and energy distribution[J]. Acta Sedimentologica Sinica, 1999, 17(S1): 769-774.
| Citation: |
LI Yuan, LI Ren-wei, SHANG Yu-min, LI Ning-bo. The Environment Sedimentol ogical Study on Erhal Lake,Yunnan Province——Sediments particl a size distribution,f1ow direction and energy distribution[J]. Acta Sedimentologica Sinica, 1999, 17(S1): 769-774.
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