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Related Experiment Video

Updated: May 9, 2026

Early Detection of Cyanobacterial Blooms and Associated Cyanotoxins using Fast Detection Strategy

Early Detection of Cyanobacterial Blooms and Associated Cyanotoxins using Fast Detection Strategy

Published on: February 25, 2021

A method to analyze "source-sink" structure of non-point source pollution based on remote sensing technology.

Mengzhen Jiang¹, Haiying Chen, Qinghui Chen

¹Third Institute of Oceanography, State Oceanic Administration, No. 178 Daxue Road, Xiamen 361005, China.

Environmental Pollution (Barking, Essex : 1987)

|August 6, 2013

Summary

This study maps non-point source pollution in the Jiulongjiang Estuary using a new index. It identifies key "source" and "sink" areas for nitrogen and phosphorus, aiding environmental planning.

Keywords:

Grid Landscape Contrast Index Remote sensing “Source–sink” structure

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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

Area of Science:

Environmental Science
Ecology
Remote Sensing

Background:

Non-point source pollution poses a significant threat to estuarine ecosystems.
Effective environmental planning requires accurate spatial identification of pollution sources and sinks.
The Jiulongjiang Estuary faces challenges in managing nutrient pollution.

Purpose of the Study:

To develop a scientific basis for environmental planning and improve pollution regulation efficiency.
To establish the Grid Landscape Contrast Index (GLCI) based on the "source-sink" theory.
To map the spatial distribution of non-point source pollution in the Jiulongjiang Estuary.

Main Methods:

Utilized high-resolution remote sensing images for spatial analysis.
Applied the "source-sink" theory to understand pollution dynamics.
Developed and implemented the Grid Landscape Contrast Index (GLCI).

Main Results:

Identified "source" areas totaling 534.42 km(2) and "sink" areas of 172.06 km(2) in 2008.
Located major pollution "source" regions on Xiamen island, Haicang, Jiaomei, and along riverbanks.
Determined primary "sink" areas in southwest Xiamen island and west Shima.

Conclusions:

Pollution "source" intensity generally decreases with distance from the sea boundary.
"Sink" intensity generally increases with distance from the sea boundary.
The developed GLCI provides a valuable tool for estuarine pollution management and environmental planning.