非稳态地下水流系统响应降雨变化的数值模型研究

张萧琅; 焦赳赳

doi:10.19509/j.cnki.dzkq.tb20230030

非稳态地下水流系统响应降雨变化的数值模型研究

doi: 10.19509/j.cnki.dzkq.tb20230030

张萧琅^1,,
焦赳赳^2, ,

1.
俄亥俄州立大学地球科学学院, 俄亥俄州哥伦布市 43210
2.
香港大学地球科学系, 香港 999077

基金项目:

国家自然科学基金项目 41572208

详细信息

作者简介:
张萧琅(1992—)，男，主要从事地下水循环的科研工作。E-mail: xiaolangzhang@foxmail.com

通讯作者:
焦赳赳(1963—)，男，教授，博士生导师，主要从事水文地质教学和科研工作。E-mail: jjiao@hku.hk

中图分类号: P641
计量
- 文章访问数: 504
- PDF下载量: 43
- 被引次数: 0
出版历程
- 收稿日期: 2023-01-17
- 录用日期: 2023-05-11
- 修回日期: 2023-04-07

Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfall

Zhang Xiaolang^1
,,
Jimmy Jiu Jiao^{2
, ,}

1.
School of Earth Sciences, The Ohio State University, Columbus, Ohio 43210, USA
2.
Department of Earth Sciences, The University of Hong Kong, Hong Kong 999077, China

摘要

摘要:
区域地下水流系统的发育受地质、气候和地形多种因素的影响。以往的地下水流系统研究主要探讨了地质、地形和稳态气候条件下所形成的局部、中间和区域流动系统的组成特征, 对非稳态的地下水流系统认识不足。聚焦于研究地下水流系统对降雨变化的动态响应规律, 使用HydroGeoSphere构建了剖面二维地下水地表水耦合数值模型, 模拟在降雨的周期性和随机性叠加动态驱动下非稳态渗流场形成的地下水流系统。模拟结果表明, 各层级流动系统的空间范围都会随着降水波动而发生变化。局部地下水流系统在雨季并非都处于扩张状态, 在旱季也并非都处于收缩状态。各个局部流动系统的同时刻穿透深度之间可能具有无关、正相关或负相关关系, 这取决于各个局部流动系统响应降雨变化的滞后性。中间流动系统在非稳态条件下非常活跃, 其排泄出口、补给入口和循环路径随时间变化, 并强烈影响局部流动系统。通过5种不同含水层参数和降雨情景的模拟对比, 发现地下水流系统的滞后性和穿透深度的相关性对含水层各向异性特征较为敏感。下一步, 需要更加深入地研究地下水流系统在季节尺度、多年乃至跨世纪时间尺度气候波动过程中的非稳态响应规律。
- 地下水流系统 /
- 局部流动系统 /
- 循环深度 /
- 降雨
Abstract: Objective
Geological, climatic, and topographical conditions control regional groundwater flow systems. Previous researchers have made significant advancements in developing the theory of groundwater flow systems under steady-state climatic conditions. However, there has been limited progress in comprehensively understanding transient groundwater flow systems.
Methods
To address this gap, we constructed a two-dimensional numerical model that couples groundwater and surface water using HydroGeoSphere. We then examined the relationships among the subsystems of transient groundwater flow systems in response to variations in rainfall.
Results
The results demonstrate that the areas occupied by subsystems change with rainfall fluctuations. Local groundwater flow systems may neither expand during wet seasons nor contract during dry seasons. The relationships among the penetration depths, which indicate the elevation of the lowest point in a local flow system, can be positive, negative, or unrelated. This variation mainly arises from the high activity of intermediate groundwater flow systems under transient conditions, where their inputs, outputs, flow paths, and areas of recharge and discharge vary with rainfall fluctuations. These relationships are also sensitive to factors such as geology (hydraulic conductivity, specific storage), climate (rainfall rate), and topography (local and regional).
Conclusion
Based on a sensitivity analysis of five scenarios, changes in local flow systems are more influenced by aquifer anisotropy. Future research should prioritize conducting a more comprehensive analysis of the non-steady-state response patterns exhibited by groundwater flow systems, considering climate fluctuations on a seasonal scale, over multiple years, and even across centuries.
- groundwater flow system /
- local flow system /
- penetration depth /
- rainfall fluctuation
注释:

(所有作者声明不存在利益冲突)

HTML全文

图 1 地下水流系统示意图^[12-13]

a.流域范围和水系平面图；b.剖面地下水流系统分布；c.地表分水岭和局部地下水流系统分水点

Figure 1. Schematic diagram of groundwater flow systems

下载: 全尺寸图片幻灯片

图 2 香港地区1974-2014年的逐月降雨量柱状图

Figure 2. Monthly rainfall rate from 1974 to 2014 in Hong Kong

下载: 全尺寸图片幻灯片

图 3 同向局部地下水流系统相对穿透深度(D/Z₀)的变化曲线

Figure 3. Penetration depths of the codirectional local flow systems

下载: 全尺寸图片幻灯片

图 4 逆向局部地下水流动系统相对穿透深度(D/Z₀)的变化曲线

Figure 4. Penetration depths of the counterdirectional local flow systems

下载: 全尺寸图片幻灯片

图 5 同向局部地下水流系统相同时刻穿透深度之间的关系

Figure 5. Relations between penetration depths of the codirectional local flow systems

下载: 全尺寸图片幻灯片

图 6 5种模拟情景(情景1至情景5)地下水流系统平均状态与Darcy流速的绝对值logV分布图^[12-13]

Figure 6. Average flow patterns and darcy velocity magnitude logV(|V|, m/d) contours (in color bands) of Case1-Case 5

下载: 全尺寸图片幻灯片

图 7 情景1至情景5的局部流动系统同时刻穿透深度之间的相关系数热图

Figure 7. Heatmap of relations between the penetration depths of local flow systems in Case1-Case5

下载: 全尺寸图片幻灯片

表 1 局部抛物线型地形的控制参数

Table 1. Values of a, b and c used to control the local topographic undulation

(x_i, x_i+1)/m	a/10^-5	b/m	c/m
(0, 712.75)	a₁=2.35	b₁=-714.29	c₁=12
(712.75, 1 337.75)	a₂=3.07	b₂=712.75	c₂=12
(1 337.75, 1 792.75)	a₃=4.84	b₃=1 792.30	c₃=10
(1 792.75, 2 792.75)	a₄=1.00	b₄=1 792.75	c₄=10
(2 792.75, 3 177.5)	a₅=9.46	b₅=3 177.37	c₅=14
(3 177.5, 3 976.7)	a₆=2.19	b₆=3 176.70	c₆=14
(3 976.7, 4 421)	a₇=4.56	b₇=4 421.14	c₇=9
(4 421, 5 254.66)	a₈=1.30	b₈=4 421.33	c₈=9
(5 254.66, 5 671)	a₉=7.49	b₉=5 671.33	c₉=13
(5 671, 6 227.11)	a₁₀=4.21	b₁₀=5 671.56	c₁₀=13
(6 227.11, 6 727.11)	a₁₁=4.40	b₁₁=6 727.11	c₁₁=11

下载: 导出CSV

表 2 局部流动系统穿透深度变化滞后降雨波动的月数

Table 2. Time lag (month) of the change in the penetration depth of local flow systems to rainfall fluctuations

流动系统	模拟情景
流动系统	情景1	情景2	情景3	情景4	情景5
WL1	5	3	4	4	4
L2	4	2	4	9	3
L3	4	3	4	4	4
L4	4	0	4	9	4
L5	4	9	3	4	4
L6	4	0	0	9	2
L7	4	3	11	0	0
L8	4	9	9	9	4
L9	1	2	10	4	0
L10	1	0	0	9	0
L11	1	9	0	0

下载: 导出CSV

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