| 程海表层沉积物粒度空间分布特征及其影响因素 |
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| 引用本文： | 胡京九,张虎才,常凤琴,李婷,蔡萌,段立曾,张龙吴,张扬.程海表层沉积物粒度空间分布特征及其影响因素[J].沉积学报,2020,38(2):340-348. |
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| 作者姓名： | 胡京九 张虎才 常凤琴 李婷 蔡萌 段立曾 张龙吴 张扬 |
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| 作者单位： | 1.云南师范大学旅游与地理科学学院，高原湖泊生态与全球变化实验室，昆明 650500 |
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| 基金项目： | 云南省领军人才项目2015HA024云南省高端人才引进项目2010CI111 |
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| 摘 要： | 由于受湖泊动力条件和物质来源的影响，湖泊表层沉积物的各粒度组分表现出不同的空间分布特征。选择滇西北程海作为研究对象，通过测试程海表层沉积物的粒度，分析了其不同粒度组分的空间分布特征，对影响程海表层沉积物粒度空间分布的因素进行探讨。研究结果表明:程海表层沉积物的优势粒级为粉砂，各样品沉积类型为黏土质粉砂。粒度组分及其参数的空间分布特征变化差异明显，黏土组分含量呈现出由南向北逐渐增加的趋势，而粉砂、中值粒级则呈现出相反的变化趋势，表明程海沉积物粒径受盛行南风的控制与影响，表现为湖泊水动力由南向北逐渐减弱。程海表层沉积物的粒度空间分布特征表明，其表层沉积物易受盛行风的影响向北扩散，因此，应加强该地区沿岸，特别是南岸人类活动的管理，有效控制人为物质的输入，减少污染物的扩散。
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| 关 键 词： | 程海 表层沉积物 粒度 空间分布 |
| 收稿时间： | 2018-11-26 |
Spatial Distribution of Grain Size Composition of Surface Sediments in Lake Cheng (Chenghai) and Their Influential Factors |
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| Institution: | 1.Key Laboratory of Plateau Lake Ecology & Global Change, Yunnan Provincial Key Laboratory of Geographical Process and Environmental Change on the Plateau, College of Tourism and Geography Science, Yunnan Normal University, Kunming 650500, China2.Key Laboratory of Plateau Lake Ecology & Environment Change, Institute of Plateau Lake Ecology and Pollution Management, School of Resource Environment and Earth Science, Yunnan University, Kunming 650504, China |
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| Abstract: | Due to the influence of dynamic conditions and material sources in a lake, the spatial distribution characteristics of the surface sediment are different. In this study, Lake Cheng (or Cheng Hai) in northwest Yunnan was selected as the research object. We tested the surface grain size index, analyzing the spatial distribution characteristics for the different components of surface sediment grain size and discussing factors affecting the spatial distribution of grain size. The results show that silt is the dominant granule of surface sediments in Lake Cheng, and the sedimentary types of the samples are clay silt. The spatial distribution for the sediment particle size components and their parameters on the surface of Lake Cheng is obviously different. Clay shows an increasing trend from south to north, while powder sand and median grain size indicate the opposite, indicating that, in Lake Cheng, the hydrodynamic force gradually decreases from south to north under the influence of a prevailing south wind. The spatial distribution of surface sediments in Lake Cheng indicates that the surface sediments are subject to the prevailing wind and spread northward. Therefore, the management of human activities on the coast of this area should be strengthened to reduce the diffusion of pollutants. |
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