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Related Concept Videos

Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

Mechanistic Models: Compartment Models in Individual and Population Analysis

Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least squares (OLS)...
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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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Related Experiment Video

Updated: Jun 3, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

An evaluation of catchment-scale phosphorus mitigation using load apportionment modelling.

S Greene1, D Taylor, Y R McElarney

  • 1School of Natural Sciences, Trinity College, University of Dublin, Dublin, Ireland. shgreene@tcd.ie

The Science of the Total Environment
|March 25, 2011
PubMed
Summary

A load apportionment model (LAM) in Ireland revealed that point sources significantly contributed to phosphorus (P) pollution, even when diffuse sources dominated exports. Mitigation measures effectively reduced P loads, demonstrating the model

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Last Updated: Jun 3, 2026

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Area of Science:

  • Environmental Science
  • Hydrology
  • Water Quality Management

Background:

  • Phosphorus (P) pollution is a major driver of freshwater eutrophication.
  • Understanding the sources of P loading is crucial for effective mitigation strategies.
  • Intensively farmed catchments present complex challenges for P management.

Purpose of the Study:

  • To develop and apply a load apportionment model (LAM) to a freshwater catchment in Ireland.
  • To differentiate between point and diffuse phosphorus sources and their contributions to total load.
  • To assess the effectiveness of P mitigation measures on reducing catchment P loading.

Main Methods:

  • Utilized a load apportionment model (LAM) calibrated with fourteen years of data (1995-2008).
  • Incorporated geospatial and water quality data from a 256km(2) lake catchment.
  • Analyzed river total P (TP), molybdate reactive P (MRP), and runoff data from seven subcatchments.

Main Results:

  • Identified temporal and spatial heterogeneity in P sources, linked to agricultural intensity, soil type, and effluent loading.
  • Demonstrated that point sources could dominate P loads, especially during high flow events, even when diffuse sources were the annual majority.
  • Quantified up to 80% reductions in point MRP load following targeted mitigation measures.

Conclusions:

  • The LAM effectively inferred changes in P sources during mitigation efforts.
  • Mitigation measures, including enhanced wastewater treatment and rural bye-laws, significantly reduced P export rates.
  • The LAM approach is valuable for assessing the long-term effectiveness of P reduction strategies in river basin districts.