| 由明宇.大理冲积扇含水层非均质性分布规律研究[J].地质与勘探,2016,52(4):734-742 |
| 大理冲积扇含水层非均质性分布规律研究 |
| Heterogeneous distribution of the aquifer sediments in an alluvial fan of Dali, Yunnan |
| 投稿时间：2015-11-20 修订日期：2016-07-03 |
| DOI： |
| 中文关键词: 冲积扇 沉积特征 非均质 隐仙溪 大理 |
| 英文关键词: alluvial fan, sedimentary characteristics, heterogeneity, Yinxianxi, Dali |
| 基金项目:国家自然基金项目“冲积扇含水层非均质性构建及其溶质迁移数值模拟研究”（41402215）、国家自然基金项目“岩溶-裂隙含水层地下水重金属迁移机理研究”（41562012）、昆明理工大学引进人才基金资助项目（KKZ3201421026）共同资助 |
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| 中文摘要: |
| 洪-冲积扇的非均质性分布规律对含水层渗流和污染物迁移研究、地下水污染管理、控制及修复具有重要意义。本文以大理点苍山东麓隐仙溪洪-冲积扇为例，对其水动力条件、沉积构造模型、地形坡度与运移距离的关系进探讨。研究表明，冲积扇沉积非均质受水动力条件影响，当水动力较好时，沉积颗粒物为砾石和漂砾，填充泥质和粉砂质，水动力较弱时沉积多为砂质和粘土颗粒，扇面整体以水流河道为中心轴呈扇形沉积；冲积扇沉积颗粒物的分选性和磨圆度受地形坡度的影响，地形坡度大沉积颗粒物分选性和磨圆度差，搬运距离越远分选性和磨圆度越好；扇顶因水动力强，坡度大，沉积物分选性和磨圆度差，层理不发育，扇中扇缘随着水动力条件及地形坡度减弱，沉积物分选性和磨圆度逐渐变好，层理较为发育，沉积为水平或均匀层理。 |
| 英文摘要: |
| Alluvial fan is a kind of typical aquifers. The heterogeneous distribution of its sediments is important for the study of aquifer transfusion and migration of contamination as well as its management, control and recovery. Taking a alluvial fan of Dali as an example, this work studies the dynamic conditions, sedimentary structure model and the relationship between slope and distance of alluvial fan. Research shows that alluvial fan depositional heterogeneity is affected by hydrodynamic conditions. When the water power is better, the sedimentary particles are gravel and boulder and fill the muddy and silty. As the hydrodynamic is weak, sedimentary particles are dominated by sandy and clay grains. Sorting characteristics and grinding roundness of sedimentary particles are influenced by terrain slope. It means that as the local gradient is larger, sorting and roundness of sedimentary particles will become poor, while the farther distance can lead to better separating and grinding roundness. For the top fan, because of the strong hydrodynamic, slope, sediment separation and poor psephicity, bedding cannot develop well. At the fan edge, as the hydrodynamic conditions and terrain slope become weaker and sediment sorting and roundness are gradually getting better; more beds develop to result in horizontal deposition or uniform beds. |
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