什么是河流流量（径流量）？
What is river discharge?
河流流量是单位时间内通过某一断面的水量，通常用立方米每秒表示，等于断面面积乘以平均流速。它随降雨、融雪和季节波动，是水资源管理的关键指标。
River discharge is the volume of water passing a cross-section per unit time, usually cubic meters per second, equal to cross-sectional area times average velocity. It varies with rain, snowmelt, and season and is key to water management.
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
#流量 #径流量 #流速
华北平原这类长期超采区,即便地下水位止跌回升,地面沉降为什么也几乎无法同步恢复?
In chronically over-drafted basins such as the North China Plain, why does land subsidence largely persist even after water tables stop falling and begin to recover?
抽水使孔隙水压力下降,上覆载荷转由颗粒骨架承担,有效应力增大驱动黏性土层压密排水;这种固结变形基本上不可逆,人工回灌也只能恢复其中很小的弹性份额。结果就是水位企稳后沉降速率放缓,但已损失的含水层储水能力和地面高程大部分永久丧失。
Pumping lowers pore-water pressure and transfers overburden load onto the grain skeleton; the increased effective stress compacts clay layers essentially irreversibly, and managed recharge recovers only a minor elastic fraction of the deformation. Subsidence rates therefore slow once levels stabilize, yet most of the lost aquifer storage and land elevation remain gone.
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 #有效应力
降雨早已停止,河流为什么仍能连续数周维持径流?退水曲线分析又如何把地下水的贡献从河川流量过程中剥离出来?
Long after the rain has stopped, why can a river keep running for weeks on end, and how does recession-curve analysis tease the groundwater share out of the streamflow hydrograph?
雨水渗入土壤与裂隙后缓慢下移补给含水层,含水层再经由泉口和河床持续排泄,构成洪峰过后平缓的基流段。基流退水在半对数图上近似一条直线,其斜率反映含水层的储水与导水能力。据此把响应迅速的直接径流与退水迟缓的地下水源分割开,便能估算每场洪水事件中两类来水的占比。
Infiltrated rain percolates slowly through soil and fractures into aquifers, which then drain steadily through springs and channel beds to form the gentle tail of the hydrograph after the flood peak. Plotted on semi-logarithmic axes, this baseflow recession approaches a straight line whose slope encodes the aquifer's storage and transmissive behavior. Splitting the quick direct runoff from the sluggish groundwater component on that basis lets hydrologists estimate what fraction of each flood event came from each source.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Hall 1968 年发表于《Reviews of Geophysics》的基流退水研究综述
F. R. Hall, Base-flow recessions—a review, Reviews of Geophysics, 1968
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1029/wr004i005p00973：Base‐Flow Recessions
#基流退水 #流量过程分割
奥加拉拉含水层为何是美国农业的关键却又面临透支？
Why is the Ogallala Aquifer crucial to US agriculture yet threatened by overdraft?
奥加拉拉含水层横贯北美大平原，储存着更新世遗留的地下水，灌溉着美国大片小麦与玉米带。其补给速率极慢，而抽取速度远超自然回补，导致水位持续下降。美国地质调查局的研究显示部分地区已出现不可持续的枯竭。
The Ogallala Aquifer underlies the North American Great Plains, holding Pleistocene-era groundwater that irrigates vast US wheat and corn belts. Recharge is extremely slow while pumping far exceeds natural replenishment, so water levels keep dropping. USGS studies show unsustainable depletion in parts of the region.
难度 进阶 · 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
#奥加拉拉含水层 #地下水 #农业灌溉
什么是“含水层”（aquifer）？地下水是怎样补充的？
What is an aquifer, and how is groundwater replenished?
含水层是能储存并传导地下水的多孔岩石或砂砾层，像天然“地下水库”。当地表水（雨水、河水）通过入渗缓慢渗入地下、到达饱和带时，就完成了“补给”（recharge）。过度抽取或补给减少会使含水层枯竭、地面沉降。
An aquifer is a porous rock or gravel layer that stores and transmits groundwater, acting like a natural underground reservoir. When surface water (rain or rivers) infiltrates downward and reaches the saturated zone, it is 'recharged.' Over-pumping or reduced recharge can deplete aquifers and cause land subsidence.
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 #地下水 #入渗 #补给 #地面沉降
什么是“流域”（分水岭/集水区）？
What is a watershed (drainage basin)?
流域是一片所有降水都顺着地势汇流到同一条河流（或湖泊、河口）及其支流的陆地范围，由分水岭（山脊线）界定边界。流域是自然水文管理的基本单元，上游的活动会直接影响下游的水质与水量。
A watershed is the area of land where all precipitation drains to a common river (or lake/estuary) and its tributaries, bounded by a divide such as a ridge line. It is the basic unit of natural hydrologic management, and activities upstream directly affect water quality and quantity downstream.
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
#流域 #分水岭 #集水区 #汇流 #水文单元
湖泊一般可以怎样分类？
How can lakes generally be classified?
按成因湖泊可分为构造湖、火口湖、冰川湖、河成湖和人工湖等。例如贝加尔湖是构造断裂形成的深水湖，而许多堰塞湖由滑坡或火山物质堵塞河道而成。
By origin, lakes are classified as tectonic, crater, glacial, fluvial, and artificial, among others. Lake Baikal is a deep tectonic rift lake, while many barrier lakes form when landslides or volcanic debris block a river.
难度 进阶 · 适合 小学高段(9-12)
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
#湖泊 #构造湖 #成因
什么是河流三角洲？
What is a river delta?
三角洲是河流入海或入湖时因流速骤减、泥沙堆积形成的扇形平地。它土地肥沃、物种丰富，却也易受热带气旋和海平面上升的威胁。
A delta is a fan-shaped plain of sediment built where a river slows and drops its load as it meets the sea or a lake. Fertile and biodiverse, deltas are also vulnerable to storms and sea-level rise.
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
#三角洲 #泥沙 #堆积
什么是蒸腾作用？
What is transpiration?
蒸腾是植物通过叶片气孔把体内水分释放到大气中的过程，与蒸发一起构成「蒸散」。它是水循环中将陆地水分送回大气的重要环节。
Transpiration is how plants release water from inside their leaves through stomata into the air, joining evaporation as 'evapotranspiration.' It is a major way land water returns to the atmosphere in the water cycle.
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
#蒸腾 #蒸散 #植物
河流是怎样侵蚀和改造地形的？
How do rivers erode and reshape the land?
河流通过下切、侧蚀和搬运泥沙来改造地形，上游多下切形成峡谷，下游则侧蚀和堆积形成曲流与平原。长期的河流作用塑造了大部分陆地表面的形态。
Rivers reshape terrain by downcutting, lateral erosion, and transporting sediment: upstream they cut canyons, downstream they meander and build plains. Over time, river action shapes much of the Earth's land surface.
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
#河流侵蚀 #下切 #曲流
在承压含水层中,若测压水面的高程超过井口的地面高程,钻井里的水为什么会自行流出地表?这一现象与补给区的高程之间有怎样的联系?
Why does water rise out of the ground unaided when a well taps a confined aquifer whose potentiometric surface stands above the wellhead, and what does this behavior owe to the elevation of the recharge area?
承压含水层之上隔着不透水的顶板,其中的水承受着从高处补给区传来的静水压力。只要补给区比井口高出足够多,测压面便会升至地表以上,钻孔一旦揭穿顶板,水就沿井管上升并自流。因此自流的水头取决于补给区与井口的高程差,再扣除水流沿途的损失。
A confined aquifer sits sealed beneath an impermeable cap, so its water carries static pressure transmitted from a recharge zone at higher ground. When that zone stands far enough above the wellhead, the potentiometric surface tops the land surface, and drilling through the cap lets water climb the casing and spill freely. The available head equals the elevation difference between recharge area and wellhead, minus losses along the flow path.
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
#承压水 #自流井
同一场暴雨落在城市化流域,为什么洪峰比天然流域更高、而且更早到达?
When the same rainstorm falls on an urbanized basin, why is the flood peak higher and earlier than in a natural basin?
道路、屋顶等不透水面把下渗压缩到接近零,降雨的大部分直接变成地表径流,密集排水管网又在几分钟到几十分钟内把它汇入河道。两者叠加使洪水过程线被明显“尖化”:洪峰流量增大、峰现时间提前。因此现代流域治理强调透水铺装、雨水花园和上游滞蓄湿地,以恢复下渗并削减洪峰。
Impervious surfaces such as roads and rooftops push infiltration close to zero, so most rainfall turns directly into overland flow, and dense storm drains deliver it to channels within minutes. Together these effects sharpen the flood hydrograph, raising the peak discharge while moving it earlier in time. Modern basin management therefore relies on permeable paving, rain gardens, and upstream detention wetlands to restore infiltration and trim that peak.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chow V. T.、Maidment D. R. 与 Mays L. W.,《Applied Hydrology》,McGraw-Hill,1988年,城市水文学章节
Chow V. T., Maidment D. R. & Mays L. W., Applied Hydrology, McGraw-Hill, 1988, chapter on urban hydrology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780070108103 (1988)
#洪水过程 #不透水面
流域防洪规划中的重现期是什么含义?使用这一指标有哪些局限?
What does the return period mean in basin-scale flood planning, and what limitations come with using this metric?
重现期来自洪峰流量序列的频率分析:百年一遇洪水指任一年份超越概率为1%,并不是说恰好每隔一百年发生一次。该指标默认水文序列平稳,但城市化、水库调蓄与气候变化都在持续改变洪水的统计分布。因此现代流域管理通常把重现期与实时雨洪预报、淹没模拟以及韧性工程措施结合起来,而非将其单独当作设计标准。
Derived from frequency analysis of peak-discharge records, a 100-year return period denotes a 1 percent chance of being exceeded in any given year, not an event recurring exactly once per century. The metric presumes hydrologic stationarity, yet urbanization, reservoir operation, and climate change keep shifting the statistical distribution of floods. Contemporary basin management therefore combines return periods with real-time rain-flood forecasting, inundation modeling, and resilience-oriented engineering instead of relying on them alone as design standards.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Muir-Wood等,《洪水风险与气候变化:全球与区域视角》,Hydrological Sciences Journal第59卷,2014,DOI:10.1080/02626667.2013.857411
Muir-Wood et al., 'Flood risk and climate change: global and regional perspectives', Hydrological Sciences Journal, vol. 59, 2014, DOI: 10.1080/02626667.2013.857411
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1080/02626667.2013.857411：Flood risk and
#洪水风险 #流域管理
暴洪为什么来得又快又危险，哪些地形最易受灾？
Why are flash floods so sudden and dangerous, and which terrains are most at risk?
暴洪是强降雨在数小时内使小河与干谷水位骤涨的现象，常见于城市硬化地面和陡峭峡谷，因为下渗少、汇流快。它留给人员的撤离时间极短，破坏力主要来自高速水流与携带的碎屑。美国海洋大气管理局的气象服务与地质调查局都把山区与城市列为高风险区。
A flash flood is a rapid rise in small streams and dry washes within hours of heavy rain, common in cities with impervious ground and steep canyons where infiltration is low and runoff is fast. It leaves little time to evacuate, and its danger comes from fast water and debris. NOAA's Weather Service and USGS both flag mountainous and urban areas as high risk.
难度 入门 · 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
#暴洪 #城市内涝 #陡峭地形
什么是下渗？
What is infiltration?
下渗是地表水渗入土壤和岩石孔隙、补给地下水的过程。土壤的透水性、坡度和降雨强度都会影响下渗的多少。
Infiltration is the process by which surface water soaks into the pores of soil and rock to recharge groundwater. Soil permeability, slope, and rainfall intensity all affect how much infiltrates.
难度 入门 · 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
#下渗 #土壤 #补给
水循环的主要环节有哪些？
What are the main stages of the water cycle?
水循环包括蒸发、植物蒸腾、水汽输送、凝结成云，以及降水与径流回到海洋的过程。太阳能驱动蒸发，重力则引导地表与地下径流汇流。这一循环不断更新淡水资源，是水文系统研究的核心。
The water cycle includes evaporation, plant transpiration, water-vapor transport, condensation into clouds, and precipitation and runoff back to the ocean. Solar energy drives evaporation while gravity guides surface and subsurface flow. This cycle continually renews freshwater and is the core of hydrology.
难度 入门 · 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
#水循环 #蒸发 #径流
自然界里的水是怎么“旅行”的？（水循环）
How does water 'travel' in nature? (the water cycle)
太阳把江河湖海里的水晒成水蒸气升上天空，遇冷凝结成云，再以雨或雪落回地面。落下的水有的流进河流、有的渗进泥土成为地下水，最后又回到大海，周而复始地循环。
The Sun turns water in rivers, lakes, and oceans into vapor that rises into the sky, cools into clouds, and falls back as rain or snow. The water then flows into rivers or soaks into the ground as groundwater before returning to the sea, cycling over and over.
难度 入门 · 适合 幼儿(3-6)
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
#水循环 #蒸发 #凝结 #降水 #地下水
冰川是地球上重要的淡水资源吗？
Are glaciers an important source of Earth's fresh water?
是的，冰川和冰盖储存了地球约三分之二以上的淡水资源，主要集中在南极和格陵兰。它们在调节全球水循环和海平面方面起着关键作用。
Yes, glaciers and ice sheets store more than two-thirds of Earth's fresh water, mainly in Antarctica and Greenland. They play a key role in regulating the global water cycle and sea level.
难度 入门 · 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
#冰川 #淡水 #冰盖