Alluvium Property Management

Alluvium Property Management – Alluvium House was founded in 2019 as a forum to bring policymakers and business leaders together with subject matter experts (SMEs) and technologists to discuss contemporary issues. For a truly holistic approach, we invited artists to join the conversation. This played an integral part in building the community and keeping the members involved.

We believe that a genuine, generous and holistic approach to community building that integrates the social sciences, STEM and the arts best serves the public interest.

Alluvium Property Management

Alluvium Property Management

In the spirit of the Whole Earth Catalog, we believe in giving our community access to tools. Through our projects and initiatives we hope to foster conscious production and consumption.

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Corey Crawford began his career as a geologist conducting soil and climate research throughout Texas. Following Hurricane Katrina, he moved into the insurance industry managing catastrophic losses for insurance companies.

Building on this experience, Crawford moved to New York, where he oversaw complex risk management programs for clients such as Vice Media and the Woods Hole Oceanographic Institution, implemented technology-driven flood risk strategies for REITs and asset managers, including Simon Property Group and BlackRock, and launched the Betterment’s. 401k investment platform.

As a member of The European Government Relations Business Council (Ad-hoc Council) he advised organizations on emerging risks around contemporary issues such as technology, transparency, climate change and geopolitical uncertainty. The original House Drift Forum is a digital version of the Chatham House Law Format of the Ad Hoc Board.

Over the past twenty years he has also found success in the music industry as a resource on vintage musical equipment, commercial recording studio owner and songwriter. An alluvial fan is an accumulation of sediments that blows out from a constricted source of sediments, such as a narrow canyon emerging from a escarpment. They are typical of mountainous terrain in arid to semi-arid climates, but are also found in more humid areas subject to heavy rainfall and in areas of modern glaciation. Their area ranges from less than one square kilometer (0.4 square miles) to nearly 20,000 square kilometers (7,700 square miles).

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Alluvial fans are usually formed where flow exits a closed channel and is free to spread and penetrate the surface. This reduces the carrying capacity of the flow and causes sediment deposition. The flow can take the form of a rare debris flow or one or more ephemeral or eternal streams.

Alluvial fans are common in the geologic record, such as in the Triassic basins of eastern North America and the New Red Sandstone of southern Devon. Such fan deposits probably contain the largest accumulations of gravel in the geologic record. Alluvial fans have also been found on Mars and Titan, showing that flow processes occurred on other worlds.

Some of the largest alluvial fans are found along the Himalayan front in the Indo-Gangetic Plain. Displacement of the feeder channel (nodal absorption) can lead to catastrophic flooding, as occurred on the Kosi River fan in 2008.

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An alluvial fan is an accumulation of depressions that emerges from a concentrated source of depressions, such as a narrow canyon emerging from an escarpment. This accumulation is shaped like a section of a shallow cone,

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Alluvial fans vary greatly in size, from only a few meters at the base to up to 150 kilometers across, with a slope of 1.5 to 25 degrees.

The slope measured from the apex is generally concave, with the steepest slope near the apex (the proximal fan

) and becomes less steep further out (the medial or middle fan) and shallower at the edges of the fan (the distal fan or outer fan). Sieve deposits, which are lobes of coarse gravel, may be present on the proximal fan. Alluvial fan deposits are generally coarse and poorly sorted, with the coarsest deposits being on the proximal fan.

When there is enough space on the alluvial plain for all the alluvial deposits to ventilate without making contact with valley walls or other rivers, an unconfined alluvial fan develops. Unconstrained drift fans allow sockets to vent naturally, and the fan shape is not affected by other topological characteristics. When the alluvial plane is more restricted, so that the fan comes into contact with topographic barriers, a restricted fan is formed.

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Wave or channel erosion of the fan tip (lateral erosion) sometimes produces a “finger cut” fan, where the fan tip is marked by a small indentation.

Toe-truncated fans may record climate change or tectonic processes, and the process of lateral erosion may support the fan’s aquifer or oil reservoir.

When many rivers and streams emerge from a mountain front onto a plain, the fans can combine to form a continuous apron. This is referred to as an alluvial plain in Jeddah or Piedmont.

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As the flow exits the feed duct onto the fan surface, it is able to spread into wide, shallow channels or penetrate the surface. This reduces the carrying capacity of the flow and causes sediment to be deposited.

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This channel is subject to obstruction by accretionary depressions or debris flows, causing the flow to periodically break out of its old channel (nodal engulfment) and move to a steeper-sloping part of the fan, where sedimentation resumes.

As a result, usually only a portion of the fan is active at any given time, and the bypassed areas may undergo soil formation or erosion.

What type of fan is formed is controlled by the climate, tectonics, and type of rock in the area that feeds the flow into the fan.

Debris flow fans receive most of their precipitation in the form of debris flows. Debris flows are slurry-like mixtures of water and particles of all sizes, from clay to rock, similar to wet concrete. They are characterized by having a yield strength, meaning they are very viscous at low flow velocities but become less viscous as the flow velocity increases. This means that a debris flow can be stopped while it is still on gently sloping ground. The flow crystallizes under its own weight.

Groundwater Flooding In A River‐connected Alluvial Aquifer

Debris flow fans occur in all climates, but are more common where the source rock is matrix-rich mudstone or sproulite rather than coarser, more permeable regolith. The abundance of fine-grained sediments encourages initial hillslope failure and subsequent cohesive flow of debris.

Saturation of clay-rich colluvium by locally intense thunderstorms initiates slope failure. The resulting waste flow passes down the feed channel and onto the surface of the fan.

Debris flow fans have a network of mostly inactive distribution channels in the upper fan, making way for mid to lower level lobes. The channels will be filled by cohesive debris flows later. Usually only one lobe is active at a time, and inactive lobes may develop a desert varnish or develop a soil profile from eolian dust deposition, on time scales of 1,000 to 10,000 years.

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Because of their high viscosity, debris flows td be confined to the proximal and medial fan ev in a debris flow-dominated alluvial fan, and stream floods dominate the distal fan.

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However, some debris-flow-dominated fans in arid climates are composed almost to exhaustion of lagging debris and gravel flows from eolian debris flow, with no evidence of sheet floods or sieve deposits.

Current fans (fans controlled by current flow) receive most of their sediment in the form of current flow rather than debris flow. They are less sharply differentiated from normal sediments than debris flow fans.

Stream fans occur when there is perennial, seasonal, or ephemeral stream flow that feeds a system of distributary channels on the fan. In arid or semi-arid climates, deposition is controlled by infrequent but intense rainfall, which produces flash floods in the feeder channel.

The result is sheet flooding on the alluvial fan, where the water leaves its channel and spreads across the fan. These may include overburden flows containing 20% ​​to 45% sediment, which are intermediate between sheet floods with 20% or less sediment and debris flows with more than 45% sediment.

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When the flood recedes, it often leaves a trail of gravel deposits that look like a network of braided streams.

Where flow is more continuous, such as with spring snowmelt, meandering channel flow in channels 1–4 meters (3–10 ft) high occurs in a network of braided streams.

The Kosi and other fans along the Himalayan front in the Indo-Gangetic plain are examples of massive stream-flow controlled alluvial fans, sometimes described as megafans.

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Here, continued movement on the Main Boundary Thrust for the past t million years has focused the drainage of 750 kilometers (470 mi) of mountain front into just three intense fans.

Solved Fault Piedmont Slope Piedmont Slope Bajada Alluvial

Alluvial fans are common in the geologic record, but may have been especially important before the evolution of land plants in the mid-Palaeozoic.

They are typical of faulted basins and can be 5,000 meters (16,000 ft) or more thick due to tectonic subsidence of the basin and uplift of the mountain front. Most are red from hematite produced by diegetic alteration of iron-rich minerals in shallow, oxidized vironmate. Examples of Paleocenes include the Triassic basins of eastern North America and the New Red Sandstone of South Devon,


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Halo, Saya adalah penulis artikel dengan judul Alluvium Property Management yang dipublish pada August 19, 2022 di website Smallcave