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A geologic formation that contains water which is not easily extractable for use, because of the low permeability of the formation's constituent material.
Wiki User
∙ 15y ago
Wiki User
∙ 8y agoAn aquiclude is a solid, impermeable area underlying or overlying an aquifer.
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How do you use the word aquiclude in a sentence?
(An aquiclude is an impermeable water barrier underground) The formation of an aquiclude meant that there were no deep water sources for irrigation.
How is an aquifer different from an aquitard?
aquifer-is a wet underground layer of water-bearing permeable rock or unconsolidated materials (gravel, Sand, silt, or clay) from which groundwater can be usefully extracted using a water well. WHILE Aquiclude-An impermeable body of rock or stratum of sediment that acts as a barrier to the flow of groundwater
What is the bedrock below an aquifer called?
The bedrock below an aquifer is called the water table. For example if a hole is dug into sand, very wet and saturated sand at shallow depth this would represent the aquifer and the level to which the water rises in this hole would be called the water table.
Which type of bedrock provides the greatest risk of landslides?
There are a number of possible answers to this question. It is possible that bedrock with a very low permeability (essentially acting as an aquiclude or impermeable cap so not letting water infiltrate into the underlying rock mass) would during periods of heavy rainfall cause a rapid increase in the groundwater table in overlying superficial deposits in turn causing a rapid increase in pore pressures and acting to reduce the shear strength of the soil. This would act to increase the risk of a landslide occurring. Rocks with distinct through going discontinuities or pronounced anisotropy (strong differences in strength and stiffness depending on a materials orientation - for example shales or slates are strongly anisotropic because of the through going weakness planes) where the discontinuity surfaces are oriented so that they daylight out of a slope face and act as surfaces along which sliding or failure can occur will also increase the risk of landslides occurring.
What are the disadvantages of using groundwater?
There are several problems: # This aquifer carries water to the oceans, just like above ground rivers do. This cuts off a nutrient and thermal source that ocean life depends on. # This aquifer commonly supports the land above it, so removing the water can create sink holes. # This aquifer commonly supplies multiple wells, so removing water at a new place may change how much and how deep others may have to go, and what contaminants they will see. # This aquifer frequently contains things that are unsafe to be drunk, so additional treament will be necessary. (Water quality usually changes more slowly for groundwater sources, than does a river, so that helps.) # Drawing water from this aquifer draws additional organisms from the vadose zone (and above), which will alter water quality over time. # The hole fails over time (ground settles, casings corrode, other wells lower water table), and additional expense has to be spent on into the future to maintain / repair / abandon it.
How do you use the word aquiclude in a sentence?
(An aquiclude is an impermeable water barrier underground) The formation of an aquiclude meant that there were no deep water sources for irrigation.
What part of speech is aquifuge?
The word aquifuge is a noun. It is an aquiclude.
What is impermeable layers composed of materials such as clay that hinder or prevent water movement?
aquiclude
What is aquifuge?
An aquifuge is an alternative name for an aquiclude, a solid, impermeable layer underlying or overlying an aquifer.
Rock and soil not allowing water to pass through it is called a?
The word to describe a material that does not does not allow the passage of water through it is impermeable. In hydro-geological terms it may also be described as an aquiclude.
What is an aquifuge?
aquifiers are layers of rock that are of use to ground water like a filter
What is the difference between impervious and impermeable?
In a simple Language:::: Impermeable rocks which r neither porous nor permeable.ex: Aquifuge(granite,Quartzite) Impervious rocks which r porous bt not permeable(hvng storing capacity bt not allow easy and quick flow through it)...ex: aquiclude(clay beds) - Nits(nits.geologist@gmail.com)
How is an aquifer different from an aquitard?
aquifer-is a wet underground layer of water-bearing permeable rock or unconsolidated materials (gravel, Sand, silt, or clay) from which groundwater can be usefully extracted using a water well. WHILE Aquiclude-An impermeable body of rock or stratum of sediment that acts as a barrier to the flow of groundwater
What is it when Water within a porous and permeable sedimentary rock layer that is bounded only below by a non-permeable sedimentary rock layer is called?
The permeable rock bearing the groundwater is an aquifer. If the impermeable rock layer at it's base (known as an aquiclude) is of limited lateral extent such that the groundwater level away from this area is much lower, then it may be known as a perched water table. Please see the related link for more information.
What is the bedrock below an aquifer called?
The bedrock below an aquifer is called the water table. For example if a hole is dug into sand, very wet and saturated sand at shallow depth this would represent the aquifer and the level to which the water rises in this hole would be called the water table.
Which type of bedrock provides the greatest risk of landslides?
There are a number of possible answers to this question. It is possible that bedrock with a very low permeability (essentially acting as an aquiclude or impermeable cap so not letting water infiltrate into the underlying rock mass) would during periods of heavy rainfall cause a rapid increase in the groundwater table in overlying superficial deposits in turn causing a rapid increase in pore pressures and acting to reduce the shear strength of the soil. This would act to increase the risk of a landslide occurring. Rocks with distinct through going discontinuities or pronounced anisotropy (strong differences in strength and stiffness depending on a materials orientation - for example shales or slates are strongly anisotropic because of the through going weakness planes) where the discontinuity surfaces are oriented so that they daylight out of a slope face and act as surfaces along which sliding or failure can occur will also increase the risk of landslides occurring.
Most common flat ceilings or pointed in caves?
An interesting question: I don't know that anyone has studied the statistics! Sticking to caves in limestone - the most numerous by far - it's more accurate to consider the entire cross-section of the passage. Karst cave passages develop along joint and bedding-planes - also faults but leave them for now. Initially the water dissolving the limestone occupies the whole passage volume, from its start as a minute micro-conduit. In these "Phreatic" conditions erosion takes place place along roof, floor and walls at the same time. If the guiding conduit is along a joint, the passage becomes a tube of circular cross-section. If the guide is a bedding-plane, or the intersection of joint and bedding-plane, the passage becomes elliptical as the water spreads itself into the bedding-plane on each side of the conduit. In some circumstances under phreatic conditions a layer of sediment can protect the floor from dissolution, and the passage tends to develop upwards into the joint, giving a tapering or "pointed" roof. If the roof is an insoluble "aquiclude", phreatic passages are flat-roofed - the udnerside of the aquiclude. The water will also tend to spread out below the insoluble bed to form a network of small tubes, with one eventually becomg dominant. An example familiar to me is Blacknor Hole, in Portland, (Southern England), where the aquiclude is a tabular chert band about 100mm thick within the Jurassic-age Portland Formation of limestone. On the other hand, a thin bed of resistant micrite called the Porcellaneous Band influenced many caves in the NW Pennines (Northern England), particularly Gaping Gill, to give a series of flat-floored, semi-circular phreatic passages on its upper surface. If the cave's formative stream abandons phreatic passages relatively quickly their tubular cross-sections remain intact. If though the cave's outlet level falls, typically by down-cutting of the landscape holding the springs, the cave's stream level falls to leave air above it. This is called the Vadose Phase. Now the water can attack only the walls and floor, principally the floor, and a vadose Canyon of key-hole cross-section may for. The "stem" of the keyhole is the original cylindrical phreatic tube, called the passage's 'precursor'. The section may resemble a letter T, with an arched roof, if the precursor was a bedding-plane. Sometimes bedding-plane passages can be very wide. The largest in Porth yr Ogof (South Wales) is nearly 30m wide at its widest, but not much more than 2m high, with an unusually flat roof. In very old caves, the beds in the roofs of large passages and chambers may collapse in stages to develop a cantilevered arch. To go back to passages on faults (major tectonic fractures extending throughout the rocks, often from crust upwards). The way in which a fault forms shatters the rock on each side of the fault plane, giving ready access to the water. Such passages are marked by roofs of breccia and often obstructed by fallen angular boulders. So to summarise... there is a variety of passage forms, with little or no prevalence overall of one type over the other; and the actual shape and size of a cave passage is highly individual.
