内潮によって大陸の斜面が形成される
D A Cacchione1, L F Pratson, A S Ogston
1Coastal and Marine Geology MS-999, U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, USA.
まとめ
半日間の内潮は,大陸の斜面の傾斜と沈殿に影響を及ぼします. 彼らのエネルギー伝播と反射は,下部付近の電流を強め,斜面の微細な堆積物の堆積を阻害する.
科学分野:
- 海洋学 海洋学とは
- 海洋地質学 海洋地質学
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 大陸の斜面の傾きは,様々な海洋プロセスによって形成されます.
- 内部潮流,特に半日間の潮流は,海洋における重要なエネルギードライバーです.
- 斜面の沈殿パターンは,水力力学力に敏感である.
研究 の 目的:
- 平均の大陸斜面の傾斜を決定する半日間の内潮エネルギー伝播の役割を調査する.
- 内部潮による濃縮された近底水速度と切断ストレスが沈殿と斜面形態学にどのように影響するかを分析する.
- 半日間の内潮が大陸の斜面の堆積過程に与える影響を評価する.
主な方法:
- 半日間の内潮のエネルギー伝播角度の分析.
- 底近くの水の速度と底切断のストレスの調査.
- ケーススタディ (例えば,カリフォルニア州とニュージャージー州沖の大陸の斜面) から得られた沈着パターンと底部グラデーションのレビュー.
主要な成果:
- 半日間の内潮エネルギー伝播の角度は,大陸の平均斜面傾斜 (2〜4度) と相関しています.
- 半日間の内潮の反射は,下部に近い速度とスイールストレスの強化につながります.
- 推定されるボトムシア速度は,大陸の斜面に細粒子の堆積を防ぐのに十分である.
結論:
- 半日間の内潮は,大陸の斜面の地形を形成し,沈殿に影響を与える上で重要な役割を果たします.
- 内潮に起因する水力力学力は堆積を阻害し,斜面の全体的な堆積量に影響を与えます.
- 内部潮の動態を理解することは,沈殿物の輸送と海洋盆地における斜面の進化を予測するために不可欠です.
関連する概念動画
Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Mechanisms of Membrane Domain Formation
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Tidal Forces
The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to black holes.
Micelles
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Design Example: Maintaining Level of an Embankment
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
Latitudes and Departures
Latitudes and departures are essential concepts in surveying, providing a systematic way to analyze the projections of traverse lines. These projections allow surveyors to interpret a line's north-south and east-west components, which are crucial for precisely calculating areas, bearings, and lengths. Latitude is the north-south projection of a line, calculated as the product of the line's length and the cosine of its bearing. Departure, conversely, is the east-west projection obtained by...


