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Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water
Liao, Anran1,2; Han, Dongmei1,2,3; Song, Xianfang1,2,3; Yang, Shengtian4
2021-11-01
Source PublicationJOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN0301-4797
Volume297Pages:12
Corresponding AuthorHan, Dongmei(handm@igsnrr.ac.cn)
AbstractHarmful algal bloom is prevalent in the reclaimed-water-source (RWS) river caused by the excessive nutrient's inputs. Rainfall water may be the sole nutrient-diluted water source for the RWS river. However, the effects of storm events on the algal bloom in the RWS river are poorly understood. This study presents chlorophyll-a (Chla) variations before, during, and after the initial storm events (Pre-storm, In-storm, and Post-storm) at four representative sites with distinct hydraulic conditions in a dam-regulated RWS river system, Beijing. The response of Chl-a to the initial storm events mostly depends on the ecosystem status that caused by the river hydraulic properties. The upstream is more river-like and downstream is more lake-like. In the river-like system, elevated water temperature (WT, increased by 2 %) could support the dominating algae (diatom) growth (Chl-a increased by 130 %) from Pre-storm to In-storm period. In the lake-like system, the dominant algae (blue algae) declined (Chl-a sharply decreased by 96%-99 %) due to the lower WT (decreased by 3%-7%) and increased flow velocities from Pre-storm to In-storm period. During the Post-storm period, the dominant algae break out (Chl-a surged by 20%-319 %) in the lake-like system caused by the recovered WT (increased by 3%-6%) and flow velocity. The occurrence of algal bloom can be predicted by the Random Forest (RF) model based on water quality parameters such as total nitrogen (TN). The thresholds of algal bloom for the Pre-storm, In-storm, and Post-storm periods were identified as 30 mu g/L, 10 mu g/L, and 10 mu g/L, respectively. The two driven factors were WT and nitrate (NO3-N) for the Pre-storm period and were WT and TN for the In- & Post-storm periods. A higher risk of algal bloom is highlighted during the initial storm events in the RWS river. We propose recommendations for improving water quality in the RWS river systems under the climatic change.
KeywordChlorophyll-a Algal bloom Storm event Temperature Reclaimed water
DOI10.1016/j.jenvman.2021.113376
WOS KeywordCHAOBAI RIVER ; COMMUNITY COMPOSITION ; RELATIVE IMPORTANCE ; URBAN RIVER ; INTAKE AREA ; LAKE TAIHU ; PHYTOPLANKTON ; NUTRIENT ; RESERVOIR ; TEMPERATURE
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China, China[41730749] ; Beijing Municipal Natural Science Foundation, China[8212035]
Funding OrganizationNational Natural Science Foundation of China, China ; Beijing Municipal Natural Science Foundation, China
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000691273600007
PublisherACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/165012
Collection中国科学院地理科学与资源研究所
Corresponding AuthorHan, Dongmei
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
3.Univ Chinese Acad Sci UCAS, Sino Danish Coll SDC, Beijing 100049, Peoples R China
4.Beijing Normal Univ, Beijing 100875, Peoples R China
Recommended Citation
GB/T 7714
Liao, Anran,Han, Dongmei,Song, Xianfang,et al. Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2021,297:12.
APA Liao, Anran,Han, Dongmei,Song, Xianfang,&Yang, Shengtian.(2021).Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water.JOURNAL OF ENVIRONMENTAL MANAGEMENT,297,12.
MLA Liao, Anran,et al."Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water".JOURNAL OF ENVIRONMENTAL MANAGEMENT 297(2021):12.
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