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Updated: May 20, 2026
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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
Published on: September 26, 2017
Suspended sediment estimation and analysis in river basins with rice paddy fields
E Lapong1, M Fujihara, T Izumi
1The United Graduate School of Agricultural Sciences, Ehime University, 3-5-7 Tarumi, Matsuyama City, 790-8566, Japan. elapong@yahoo.com
Summary
Agricultural activities, particularly rice transplanting, significantly increase suspended sediment load (SL) in rivers. Data stratification and seasonal analysis enhance sediment prediction models, revealing non-natural erosion sources.
Area of Science:
- Environmental Science
- Hydrology
- Agricultural Science
Background:
- Suspended sediment is a key water quality indicator in agricultural effluents.
- Agricultural watersheds, especially those with rice paddies, face challenges with sediment runoff.
Purpose of the Study:
- To analyze suspended sediment load (SL) in rivers draining agricultural watersheds.
- To develop and improve suspended sediment prediction models.
- To quantify the impact of rice transplanting on riverine SL.
Main Methods:
- Daily monitoring of suspended sediment load over 33 months.
- Application of data stratification techniques for analysis.
- Development of suspended sediment prediction models.
- Seasonal analysis comparing rice and non-rice transplanting periods.
Main Results:
- Data stratification improved the correlation between discharge and SL, reducing model errors.
- Seasonal clustering improved regression equations, though not always statistically significant.
- Suspended sediment load was notably higher during the rice transplanting season.
Conclusions:
- Rice transplanting activities contribute significantly to suspended sediment in rivers.
- The findings suggest that sediment sources may extend beyond natural soil erosion.
- Improved sediment prediction models are crucial for managing agricultural water quality.
