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Sampling Plans01:23

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Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
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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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Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
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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.
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Related Experiment Video

Updated: Dec 15, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
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A simulation-based method to develop strategies for nitrogen pollution control in a creek watershed with sparse data.

Zhenyu Zhang1, Jinliang Huang2, Cairong Xiao1

  • 1Fujian Key Laboratory of Coastal Pollution Control, Xiamen University, Xiamen, 361102, China.

Environmental Science and Pollution Research International
|July 8, 2020
PubMed
Summary

Effective nitrogen (N) management in creeks is vital. This study developed a simulation-optimization approach for nitrogen pollution control in Shixi Creek, successfully identifying rural sewage as a major pollutant source and proposing reduction strategies for improved water quality.

Keywords:
NitrogenPoint source pollutionQUAL2KWater management

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Area of Science:

  • Environmental Science
  • Water Resource Management
  • Ecological Modeling

Background:

  • Sparse data presents challenges for reliable water quality evaluations and nitrogen (N) management in creek environments.
  • Effective nitrogen targets are crucial for local water management, but data scarcity often hinders accurate assessments.

Purpose of the Study:

  • To develop a simulation-optimization approach for nitrogen pollution control strategies in Shixi Creek, addressing data limitations.
  • To identify and analyze major water pollutant sources impacting Shixi Creek's water quality.
  • To propose effective N reduction targets for achieving specific water quality standards.

Main Methods:

  • Utilized a simulation-optimization approach integrated with the QUAL2K model for nitrogen pollution assessment.
  • Validated the model against field observations from 22 sampling sites spanning March 2017 to February 2019.
  • Analyzed pollutant sources and seasonal variations influencing nitrogen transformation in the creek.

Main Results:

  • The QUAL2K model demonstrated good agreement with field data, with a normalized objective function (NOF) below 0.360.
  • Identified rural sewage discharge as the primary contributor to nitrogen pollution in Shixi Creek.
  • Determined that reducing N pollution by over 55% from point sources and 10% from nonpoint sources is necessary to meet Grade III water quality standards in 80% of the creek area.

Conclusions:

  • The developed simulation-optimization approach effectively evaluates water management strategies for creek watersheds with sparse data.
  • Targeted reductions in point and nonpoint source nitrogen pollution are essential for improving water quality in Shixi Creek.
  • Understanding seasonal variations is important for managing riverine nitrogen transformation.