| 基于土柱排水实验探讨潜水含水层给水度的影响因素 |
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| 引用本文： | 孙蓉琳,何世伟,黄康.基于土柱排水实验探讨潜水含水层给水度的影响因素[J].地球科学,2021,46(5):1840-1847. |
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| 作者姓名： | 孙蓉琳 何世伟 黄康 |
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| 作者单位： | 中国地质大学环境学院,湖北武汉 430078 |
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| 基金项目： | 国家自然科学基金项目41102155国家自然科学基金项目41772268中国地质调查局项目121201001000150121 |
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| 摘 要： | 给水度是重要的水文地质参数之一，为探讨潜水含水层给水度的影响因素，设计均质粗砂、均质细砂、上细下粗、上粗下细4种土柱的排水实验，按照一定间距分段降低地下水位，每段降深设计不同排水时间，求取不同水位埋深的给水度.当地下水位埋深小于支持毛细水高度，给水度受地下水位埋深影响显著，其关系可以用非线性函数来表示.排水时间越长，给水度越大，当土柱分段排水时间超过1 h，给水度值稳定.0.6~0.9 mm粒径的粗砂给水度大于0.2~0.4 mm的细砂；当地下水位在土层分界面下20 cm时，上细下粗土柱给水度显著增大，上粗下细土柱给水度显著减小.给水度的大小与地下水位埋深、排水时间、岩土颗粒和潜水面附近及之上非均质结构等因素有关.
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| 关 键 词： | 给水度 土柱排水 水位埋深 排水时间 非均质 水文地质学 |
| 收稿时间： | 2020-06-21 |
Study on the Influencing Factors of Specific Yield of Unconfined Aquifer Using Laboratory Column Drainage Experiment |
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| Sun Ronglin,He Shiwei,Huang Kang.Study on the Influencing Factors of Specific Yield of Unconfined Aquifer Using Laboratory Column Drainage Experiment[J].Earth Science-Journal of China University of Geosciences,2021,46(5):1840-1847. |
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| Authors: | Sun Ronglin He Shiwei Huang Kang |
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| Abstract: | Specific yield is one of the most important hydrogeological parameters of unconfined aquifer. In order to study the influencing factors of specific yield, the laboratory column drainage experiment was developed to estimate specific yield of homogeneous and stratified heterogeneous sand columns. The groundwater level was decreased according to segmentation of 2 cm or 5 cm and each section kept different drainage times to obtain the specific yield value of different depth to water table. When the depth to water table was within the capillary rise height, the relationship between specific yield and water table depth can be expressed by a nonlinear function. The specific yield value increased with the drainage time and it became constant when the drainage time of each drawdown section was more than one hour. Specific yield value of coarse sand with particle size 0.6-0.9 mm was always larger than that of fine sand with particle size 0.2-0.4 mm. When groundwater level was 20 cm under the layer interface, two different columnar structures of upper-coarse-lower-fine and vice versa exerted distinct impacts on the magnitude of specific yield. For shallow unconfined aquifer, specific yield varied with the initial depth to water table, duration of drainage, soil texture and heterogeneity near the water table. |
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