Evaluation of the Effect of Agricultural Return Flow on Water Quality, Water Quantity and Aquatic Ecology in Downstream Rivers

Water, Journal Year: 2024, Volume and Issue: 16(11), P. 1604 - 1604

Published: June 4, 2024

Agricultural water serves various functions, including public interest purposes, beyond its primary role in agricultural production. In order to evaluate the purposes of water, a quantified study effect on river flow, quality, and aquatic ecosystems is needed. Therefore, this impact environmental ecological maintenance function downstream rivers, taking into account return flow rural areas. To end, first, was evaluated by comparing quantity calculated using reservoir supply data with simulated rate through SWAT model. Second, analyzed optimal results PHABSIM The lastly, farming period quality rivers analyzed. As result analysis, it found that had large case non-rainy season, but not satisfied. confirmed (mainly considered as pollutant) significant, except for drainage duration rice paddies. can be understood only used purpose production also have positive ecology rivers.

Language: Английский

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Application and Comparison of Different Models for Quantifying the Aquatic Community in a Dam-Controlled River

International Journal of Environmental Research and Public Health, Journal Year: 2023, Volume and Issue: 20(5), P. 4148 - 4148

Published: Feb. 25, 2023

In order to develop a better model for quantifying aquatic community using environmental factors that are easy get, we construct quantitative models utilize the different relationships between water impact and biodiversity as follows: multi-factor linear-based (MLE) black box-based ‘Genetic algorithm-BP artificial neural networks’ (GA-BP) model. A comparison of efficiency their outputs is conducted by applying real-life cases, referring 49 groups seasonal data observed over seven field sampling campaigns in Shaying River, China, then performing reproduce inter-annual variation ecological characteristics Huaidian (HD) site 10 years. The results show (1) MLE GA-BP constructed this paper effective communities dam-controlled rivers; (2) performance based on black-box predicting better, more stable, reliable; (3) reproducing HD River shows species diversity phytoplankton, zooplankton, zoobenthos inconsistent, levels low due negative dam control. Our can be used tool prediction become contribution showing how other rivers assisting management strategies.

Language: Английский

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Calculation of River Ecological Flow Based on Multiple Hydrological Methods

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 12, 2023

Abstract Under the backdrop of increasing water utilization, river ecosystem problems continue to emerge. Determining ecological flow rivers is one keys comprehensive restoration ecosystems. This paper determines operability runoff sequences by means Mann-Kendal test, quantifies minimum through five representative hydrological methods, including Intra-year distribution (IYD), Flow during curve (FDC), Q90, Monthly average (MMAF) and Average in driest month (AFDM), calculates suitable monthly frequency (M-F) method three different scenarios. In addition, a comparison methods made from various aspects give recommended methods. Taking Shaying River basin as research objects, AFDM achieves best satisfaction terms demand, Q90 FDC have highest level, IYD meet requirements rhythms. The derived M-F under Scenario optimally satisfactory all respects. It determine processes result scenario b, respectively. study can be used provide scientific effective reference basis for integrated management.

Language: Английский

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