什么是含水层的“弹性贮水”与“重力释水”？二者在时间尺度上有何差异？
What are elastic storage and specific yield of an aquifer, and how do they differ in timescale?
承压含水层中水体主要靠含水层骨架与水的弹性压缩释放，称弹性贮水，响应快但贮水系数很小；潜水含水层则靠孔隙重力排水释水，称给水度（重力释水），贮水能力大但存在滞后。因此抽水时快速的水位响应多来自弹性贮水，长期均衡则取决于重力释水，二者的时间尺度差异决定水位变化与可持续开采量。
In confined aquifers, water is released mainly by elastic compression of the aquifer skeleton and the water itself—elastic storage—fast to respond but with a small storativity. In unconfined aquifers, pores drain by gravity—specific yield—which holds far more water but responds with a lag. Rapid head changes thus reflect elastic storage, while long-term yields depend on gravity drainage; this timescale contrast governs drawdown and sustainable extraction.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#弹性贮水 #释水 #承压含水层
GRACE 卫星如何通过重力测量估算地下水储量变化？
How do GRACE satellites estimate changes in groundwater storage from gravity measurements?
GRACE 双星以微米级精度测量彼此间距变化，反演地球重力场的月度异常。扣除冰川、地表水与大气等已知信号后，剩余陆地重力变化即反映地下水等总水储量的盈亏，可在无监测井地区提供大尺度估算。
GRACE's twin satellites measure their separation to micron precision, inverting monthly Earth gravity-field anomalies. After removing glaciers, surface water, and atmospheric signals, the residual land gravity change reflects total water storage including groundwater, giving large-scale estimates where wells are absent.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#GRACE #重力测量 #水储量
长期超采承压含水层为什么会引起大范围地面沉降？这种沉降为何基本无法恢复？
Why does long-term overdraft of confined aquifers cause widespread land subsidence, and why is that subsidence essentially permanent?
抽水使含水层孔隙水压力下降，上覆载荷转移给颗粒骨架，有效应力增大。砂层以可恢复的弹性压缩为主；粘土质弱透水层排水缓慢，当有效应力超过历史最大（先期固结）应力后，片状颗粒重新排列，发生不可逆的塑性压密。即便水位回升，地面也难以抬回，含水层储水能力永久受损。美国加州中央谷地累计沉降已近9米。
Pumping lowers pore-water pressure, shifting the overburden onto the granular skeleton and raising effective stress. Sands compress mostly elastically and rebound as water levels recover, but clayey aquitards drain slowly; once effective stress exceeds the preconsolidation stress, platy particles rearrange into permanent plastic compaction. Even recovered levels cannot lift the ground back, and storage capacity is lost for good - California's Central Valley has sunk by nearly nine metres.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#地面沉降 #承压含水层 #有效应力 #弱透水层
什么是含水层？孔隙含水层与裂隙含水层有何区别？
What is an aquifer, and how do porous and fractured aquifers differ?
含水层是能储存并传导地下水的岩层或土层。孔隙含水层靠砂砾等颗粒间的孔隙储水（如河流沉积），裂隙含水层则依赖岩石中的裂隙与溶孔（如石灰岩、火成岩），后者非均质性更强。
An aquifer is a rock or soil layer that stores and transmits groundwater. Porous aquifers rely on spaces between grains like sand and gravel, while fractured aquifers depend on cracks and cavities in rock such as limestone or igneous rock, the latter being far more heterogeneous.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#含水层 #孔隙 #裂隙
为何有些城市在大幅减少地下水开采后，地面沉降仍在持续？
Why does land subsidence sometimes continue in cities even after groundwater pumping is sharply reduced?
含水层系统中的弱透水夹层（隔水层）在承压水头下降时缓慢排水、压缩，其释水与压密存在滞后，可在开采停止后延续数十年。这种“延迟沉降”使沉降不会随停采立即终止，给基础设施留下长期风险。
Aquitards—low-permeability layers—drain and compact slowly as confined head drops, with a lag so their compaction can persist for decades after pumping stops. This delayed subsidence means sinking does not halt immediately when extraction ends, leaving long-term risk to infrastructure.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#地面沉降 #弱透水层 #延迟沉降
什么是地下水补给？主要补给方式有哪些？
What is groundwater recharge, and what are the main recharge pathways?
补给是地表水渗入并补充含水层的过程。主要途径包括降水入渗、河流与湖泊渗漏、灌溉回渗以及山区基岩出露区的侧向补给。补给速率受气候、植被、岩性与人类活动共同控制。
Recharge is the process by which surface water infiltrates and replenishes an aquifer. Main pathways are precipitation infiltration, river and lake leakage, irrigation return flow, and lateral inflow where bedrock outcrops in mountains. Rate is controlled by climate, vegetation, lithology, and human activity.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#地下水补给 #入渗 #渗漏
什么是地下水降落漏斗？它是如何形成的？
What is a groundwater depression cone, and how does it form?
长期集中开采地下水使井周围水位下降，在平面上形成以开采中心为凹点的漏斗状水面。开采量持续超过补给量时，漏斗范围扩大、中心深度加深，是超采的典型标志。
Sustained intensive pumping lowers the water table around wells, forming a funnel-shaped surface with the extraction center as the low point. When withdrawal persistently exceeds recharge, the cone expands and deepens—a hallmark of over-exploitation.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#降落漏斗 #地下水超采 #水位下降
什么是海水入侵？沿海超采地下水为何会引发它？
What is seawater intrusion, and why does coastal groundwater over-pumping trigger it?
海水入侵是咸淡水界面因淡水压力下降而向陆地方向推移的现象。沿海过量抽取地下水降低了淡水头，原本平衡的界面被打破，咸水楔上溯污染井水，威胁饮水与农业灌溉。
Seawater intrusion is the landward movement of the saltwater–freshwater interface when freshwater pressure drops. Coastal over-pumping lowers the freshwater head, upsetting the balance so the saline wedge advances and contaminates wells, threatening drinking and irrigation supplies.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#海水入侵 #咸水楔 #淡水头
承压含水层为什么会形成自流井？测压水位在其中扮演什么角色？
Why do confined aquifers produce artesian wells, and what role does the potentiometric surface play in this?
承压含水层夹在上下不透水的隔水层之间，补给区位于地势更高处，含水层中的水承受着超过大气压的压力。把各点的水头连成的假想曲面就是测压水位：凡是地面高程低于该面的地方，钻孔一旦揭穿隔水层，地下水便会自流涌出甚至喷出地表，形成自流井。澳大利亚大自流盆地即是经典例证，使干旱内陆无需水泵便能获得稳定水源。
A confined aquifer sits trapped between impermeable layers, and its recharge zone lies at higher elevation, so its water stands under pressure greater than atmospheric. The imaginary surface joining the hydraulic heads everywhere is the potentiometric surface: wherever the land lies below that surface, drilling through the confining layer lets groundwater flow out unaided, or even fountain upward — an artesian well. Australia's Great Artesian Basin is the classic case, supplying stable water to the arid interior without any pumping.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#承压含水层 #测压水位 #自流井 #大自流盆地