相关实验视频

Updated: Jun 7, 2025

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Published on: September 26, 2017

在长江河口侵蚀沉积条件变化下的悬浮沉积物度特征分析

Xiaolong Zhao¹, Chuanjie Liu², Zhongda Ren^3,4

¹School of Geographic Sciences, East China Normal University, Shanghai, 200241, China.

Scientific reports

|November 20, 2024

概括

长江河口由于沉积物减少而经历了显著的侵蚀,从沉积转变为侵蚀. 本研究分析了悬浮沉积物度 (SSC) 的变化及其原因,以告知管理策略.

科学领域:

河口的地质形态学
沉积物动态沉积物的动态
环境科学环境科学

背景情况:

减少河流带来的沉积物运输导致河口地区的严重土地损失.
长江上游 (2009-2022) 的降低沉积物负载严重改变了长江河口的侵蚀沉积条件.
悬浮沉积物度 (SSC) 是河口沉积物含量和健康状况的关键指标.

研究的目的:

研究长江河口SSC对不断变化的侵蚀沉积条件的反应机制.
为河口的侵蚀沉积管理提供科学见解和战略建议.
分析长江河口从沉积到侵蚀的转变.

主要方法:

收集了长江河口的历史水深数据.
在2022年9月测量的垂直SSC分布.
分析了2021-2023年的表面悬浮沉积物度 (SSSC) 数据和25个影响因素.

主要成果:

自1958年以来,长江河口首次经历了净侵蚀 (2009-2022年),年率为63.2 × 10^6 m3/年.
北通道地区的侵蚀率最高,为每年83.3毫米.
度最大区 (TMZ) 显示不规则的SSSC变化 (2021-2023),可能是由于台风和三角洲沉积物供应变化.

结论:

长江河口已经从沉积状态转变为侵蚀状态,这可能是由于人类引起的地形变化造成的.
了解SSC应对机制对于有效的河口管理和减轻土地损失至关重要.
需要进一步的研究才能充分理解影响河口SSC的因素的复杂相互作用.

关键词:

侵蚀沉积条件侵蚀沉积条件在SSC中,SSC是SSC.长江河口的长江河口.度最大的区域是度最大的区域.

更多相关视频

An Ultra-clean Multilayer Apparatus for Collecting Size Fractionated Marine Plankton and Suspended Particles

An Ultra-clean Multilayer Apparatus for Collecting Size Fractionated Marine Plankton and Suspended Particles

Published on: April 19, 2018

A Flow-through Exposure System for Evaluating Suspended Sediments Effects on Aquatic Life

A Flow-through Exposure System for Evaluating Suspended Sediments Effects on Aquatic Life

Published on: January 9, 2017

相关概念视频

Conservation of Mass in Moving, Nondeforming Control Volume

Conservation of Mass in Moving, Nondeforming Control Volume

Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...

Factors Affecting Solubility

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:

Colloids and Suspensions

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

Energy Considerations in Open Channel Flow

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...