ニュージャージー大陸の斜面における過圧と流体流動:斜面の故障と冷たい浸透への影響
1503 Deike Building, Department of Geosciences, Penn State University, University Park, PA 16802, USA.
まとめ
ニュージャージー州大陸斜面の低圧縮された堆積物は,急速な堆積による高流体圧を示している. 横圧均衡によって引き起こされるこのプロセスは,世界的に斜面の故障やコールドシップを引き起こす可能性があります.
科学分野:
- 地質学 地質学 地質学
- 地質物理学 地質物理学とは地質物理学です.
- 海洋学 海洋学 海洋学
背景:
- ニュージャージー州の大陸斜面の堆積物は,低圧縮を示しています.
- リソスタティックストレスの95%に達する高流体圧は,海洋掘削プログラムサイト1073の海底下640メートルまで観測されています.
研究 の 目的:
- ミオセーンからプレイストセンの堆積物における低圧縮と高圧流体の背後にあるメカニズムを調査する.
- 急速な沈殿,沈殿物の特性,および流体圧力の蓄積の間の関係をモデル化するために.
主な方法:
- 海洋掘削プログラムサイト1073.3からの堆積物核の分析.
- 堆積と流体の流れをシミュレートする二次元数値モデルの開発と応用.
- モデルの予測を,観察された堆積物の多孔性と流体圧力データと比較.
主要な成果:
- 二次元モデルは,観測された高流体圧をうまく予測した.
- 急速なプレイストセンの堆積物積載 浸透性のあるミオセンの砂の泥が主要な原動力として特定されました.
- 浸透性床における横圧均衡は,過負荷が薄いところの流体圧力を集中させることが示された.
結論:
- ニュージャージー州の大陸斜面における低圧縮と高流体圧力は,急速な沈殿と横流体圧力の移転の結果である.
- この現象は,斜面の安定性や,海底滑落の発生に重大な影響を及ぼします.
- この発見は,被動的な大陸の縁に冷凍浸透を誘発する潜在的グローバルなメカニズムを示唆している.
関連する概念動画
Excess Pressure Inside a Drop and a Bubble
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
Hydrostatic Pressure Force on a Curved Surface
Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
Bernoulli's Equation for Flow Normal to a Streamline
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines. However, the...
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines. However, the...
Design Example: Forces in Sluice Gate
In hydraulic engineering, sluice gates are essential for managing water flow through channels, reservoirs, and irrigation systems. Sluice gates, acting as vertical barriers, regulate water by adjusting the gate's opening height, which changes the velocity and pressure of water flowing beneath the gate. Understanding the forces involved is crucial to designing sluice gates that can withstand dynamic pressure differences, especially when the gate is closed or partially open.
Key variables in...
Key variables in...
Couette Flow
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
Energy Considerations in Open Channel Flow
Open channel flow, where a fluid flows with a free surface exposed to the atmosphere, is primarily governed by gravitational and surface effects, distinguishing it from closed conduit or pipe flow. In open channels such as rivers, canals, and artificial channels, energy analysis provides valuable insights into flow behavior and the relationship between depth, velocity, and slope.Specific Energy and Flow DepthIn open channel flow, the specific energy, E, combines the gravitational potential...


