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Updated: Jul 12, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

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Published on: July 24, 2016

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基于水,沉积物和水生态结构框架对华河 (中国) 的评估

Jing Liu1

  • 1Biology Research Department, School of Caoqiao, Suzhou, 215031, China. liujing1@buaa.edu.cn.

Environmental science and pollution research international
|October 20, 2023
PubMed
概括

人类活动造成的河流污染被评估为万河. 修复工作改善了水质,减少了重金属,但仍然存在挑战.

关键词:
污染 污染 污染恢复 恢复 恢复 恢复河流质量指数 河流质量指数流域管理 流域管理

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Quality of Water01:19

Quality of Water

In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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Testing Water Quality01:14

Testing Water Quality

When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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...
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