相关实验视频
Updated: Jun 19, 2025

12:44
Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
8.0K
景观构成和配置对不同空间和季节尺度下的河水质量的交互影响
Wei Pei1, Qiyu Xu1, Qiuliang Lei1
1State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
The Science of the total environment
|July 26, 2024
概括
景观的组成和配置相互作用,影响河流水质,而配置更有影响力. 跨季节和子流域管理景观指标是保护水质的关键.
科学领域:
- 环境科学 环境科学
- 水文学的水文学
- 生态生态学 生态生态学
背景情况:
- 河流水质受景观模式的影响,但景观组成 (COM) 和配置 (CON) 的互动效应仍然不清楚.
- 了解这些在空间和季节尺度上的影响对于有效的景观规划和水质保护至关重要.
研究的目的:
- 研究景观COM和CON对河水质量变化的相互作用影响.
- 确定特定的景观指标,在不同的空间和季节尺度上推动水质变化.
- 量化景观COM和CON对水质变化的独立和互动贡献.
主要方法:
- 从水流流域 (2018-2021) 收集的每月水样 (2018-2021).
- 生物群与环境匹配分析 (Bioenv) 用于确定COM和CON的关键景观指标.
- 多重回归 (MLR) 和冗余分析 (RDA) 探索景观与水质的关系.
- 变异分区分析 (VPA) 用于量化COM和CON的影响.
主要成果:
- 建筑用地 (COM) 和香农多样性指数 (SHDI,CON) 是水污染的关键预测指标.
- 互动贡献在沿海缓冲区 (27.66%-48.73%) 随季节性变化而变化,在下流域尺度 (38.22%-40.51%) 保持稳定.
- 景观CON在大多数时空尺度上对水质变化有更高的独立贡献.
结论:
- 识别和管理关键的景观指标,考虑时空尺度,可以提高水质的保护.
- 这项研究为有效的水质管理选择核心景观指标提供了洞察力.
- 景观配置在推动水质变化方面发挥着重要作用.
相关概念视频
Rapidly Varying Flow
57
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
57
Gradually Varying Flow
37
Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
37
What is an Ecosystem?
39.5K
Overview
39.5K
Design Example: Analyzing Capacity Contours for Flood Risk Assessment
42
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
42
Typical Model Studies
354
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
354

