地下水映射吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 07 - t17:48:53z //www.hoelymoley.com/feeds/question/13750 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/13750 7 地下水映射吗? user11377 //www.hoelymoley.com/users/12545 2018 - 03 - 28 - t05:21:23z 2018 - 03 - 28 - t21:52:48z < p >这可能是一个非常简单的问题来回答,但如何美国地质调查局地图地下水位置映射?它是一个绕核心样品?还是使用卫星和飞机?< / p > < p >也相关,这些流变化多快呢?正在测量一次足够快还是需要每天更新吗?< / p > //www.hoelymoley.com/questions/13750/-/13753 # 13753 2 答案由arkaia地下水映射是怎样的? arkaia //www.hoelymoley.com/users/111 2018 - 03 - 28 - t13:46:57z 2018 - 03 - 28 - t13:46:57z < p >美国地质调查局进行定期调查全美超过20000口井。数据收集的频率取决于网站约7000提供日常数据。一些井(目前,3777地下水网站)提供日常统计数据。越来越多的井提供实时数据(每15或30分钟更新一次)。< a href = " https://i.stack.imgur.com/b20I2.png " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/b20I2.png " alt = "美国地质调查局井" > < / > < / p > < p >来源:< a href = " https://groundwaterwatch.usgs.gov/default.asp " rel = " nofollow noreferrer " >美国地质调查局< / > < / p > < p >你可以想象每天使用这种变化< a href = " https://groundwaterwatch.usgs.gov/AnimateAWL.asp " rel = " nofollow noreferrer " > < / >动画。< / p > < p >到< a href = " https://waterdata.usgs.gov/nwis/gw " rel = " nofollow noreferrer " > https://waterdata.usgs.gov/nwis/gw < / >信息以及获取数据的能力直接从源。< / p > //www.hoelymoley.com/questions/13750/-/13758 # 13758 2 答案由haresfur地下水映射是怎样的? haresfur //www.hoelymoley.com/users/1242 2018 - 03 - 28 - t21:52:48z 2018 - 03 - 28 - t21:52:48z < p >地下水数据收集的井,arkia中描述的答案。我将放大的答案。< / p >

The driller or geologist describes the type of sediment encountered when drilling a well. Sometimes sediment samples are collected for analysis of grain size. Core samples aren't typically collected but may be for special studies. The type of sediment encountered during drilling gives a good idea as to whether a productive groundwater aquifer or the most productive zone in an aquifer is encountered. In addition the sediment samples can be used to determine the best type of well-screen to install.

A simple pumping test is usually performed to determine how much water the well will yield and the type of pump to install. This gives basic information on the aquifer (zone of productive groundwater) but sometimes more sophisticated pump tests are performed to determine the aquifer properties.

The USGS or other organization takes this information and geologic maps and maps out the extent of aquifers. Often more than one aquifer is encountered at a particular location and the aquifers are separated by impermeable sediments.

The water level in wells within an aquifer are used to map out groundwater flow directions. Groundwater flow is almost always much slower than surface streams because the groundwater is percolating between the sediment grains. The groundwater level usually changes very slowly, except in some very shallow wells. Daily measurements are usually more than enough and many wells are measured manually less frequently, monthly, quarterly, or yearly, or only now and then. It depends on whether you are interested in seasonal variation or just the general trends.

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