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- Title
Suppression of phosphorus release and acceleration of sediment consolidation via exposure to sunlight and air (sunbathing).
- Authors
Hou, Hao; Zhu, Wei; Liu, Jiming; Lin, Xiaowei; Wang, Ruochen; Xie, Santao; Wu, Hongyong
- Abstract
Introduction: High water levels are usually maintained in natural lakes and reservoirs for intensive utilization of water resources. The biological and sediment properties of lakeside zones deteriorate due to manual adjustments to water levels. In recent years, lake water levels have frequently been reduced to expose sediments to sunlight and air ("sunbathing") to restore the ecological functions of lakeside. In Lake Chao, China, this method has been carried out over the years. This study aims to investigate the impact of the sunbathing method on the sediment on the Lake Chao lakeside. Materials and methods: This study was conducted on the lakeside sediments of Lake Chao. Through field investigations, sampling, and laboratory testing, the changes in the physicochemical properties of sediments via sunbathing were investigated. In addition, laboratory experiments on phosphorus release from undisturbed sediment samples were undertaken. Field sediment columns were also collected for laboratory static phosphorus release experiments to analyze changes in phosphorus release from the sediment after sunbathing. Results and discussion: The results illustrate the advantages of sunbathing in suppressing phosphorus release, reducing organic matter content, and accelerating the consolidation of exposed sediments. However, phosphorus from decomposed algae, washed up on the shores during algal blooms and decomposed during sunbathing of shore sediments, resulted in the introduction of considerable amounts of nutrients, including phosphorus, to the water body. Conclusions: In general, sunbathing could reduce the release of phosphorus from lakeside sediments, but in areas where algal blooms frequently occur, the potential risk of nutrient release caused by algae accumulation needs to be considered.
- Subjects
SUNTAN; BODIES of water; LAKE sediments; WATER use; ALGAL blooms; WATER levels
- Publication
Journal of Soils & Sediments: Protection, Risk Assessment, & Remediation, 2024, Vol 24, Issue 2, p980
- ISSN
1439-0108
- Publication type
Article
- DOI
10.1007/s11368-023-03661-1