Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir
Though more large tropical reservoirs are being constructed to meet the increasing energy demand, knowledge on the impact of damming a tropical river and the differences along the river after its impoundment is scarce. Thus, the present study aimed to increase our understanding of such differences b...
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my.unimas.ir.265252021-04-06T01:38:50Z http://ir.unimas.my/id/eprint/26525/ Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir Ling, Teck Yee Soo, Chen Lin Kho, Chui Ping Nyanti, Lee Sim, Siong Fong Lee, Karen Suan Ping Ganyai, Tonny GE Environmental Sciences Q Science (General) QD Chemistry TP Chemical technology Though more large tropical reservoirs are being constructed to meet the increasing energy demand, knowledge on the impact of damming a tropical river and the differences along the river after its impoundment is scarce. Thus, the present study aimed to increase our understanding of such differences both longitudinally and vertically. Water and sediment samples were collected at three different functional zones in the Murum river basin ten months after impoundment began. Results show that the impoundment has an impact on both the water and sediment. Longitudinal variations of water and sediment characteristics were observed at different functional zones. The upstream riverine zone which is subjected to anthropogenic activities serves as the main input of suspended solids and nutrients to the reservoir. The nitrogen changed from a high nitrate and low ammonia condition prior to impoundment to a low nitrate and high ammonia condition due to the accumulation of organic matter and slow nitrification rate after impoundment. In the transitional and lacustrine zones, vertical stratifications of dissolved oxygen and temperature were observed. The thickness of well-oxygenated column for sensitive aquatic organisms was only two meters at some stations. Water quality in all zones showed impairment during the filling phase as compared to the good water quality index before the impoundment. The reduction of suspended solids in the surface water column in the transitional and lacustrine zone is a positive change for aquatic organisms. Sediment characteristics were found to be distinct in the transitional zone where it was lower in sand, higher in silt, clay, organic carbon and nutrients in contrast to the riverine zone. Clay increased in all zones after the impoundment. There is an urgent need to reduce the pollutants input from the upstream riverine zone. Bentus 2019-09 Article PeerReviewed text en http://ir.unimas.my/id/eprint/26525/1/Soo%20Chen%20Lin.pdf Ling, Teck Yee and Soo, Chen Lin and Kho, Chui Ping and Nyanti, Lee and Sim, Siong Fong and Lee, Karen Suan Ping and Ganyai, Tonny (2019) Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir. Polish Journal of Environmental Studies, 28 (6). 4271 -4285. ISSN 1230-1485 http://www.pjoes.com/ DOI: 10.15244/pjoes/97397 |
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GE Environmental Sciences Q Science (General) QD Chemistry TP Chemical technology Ling, Teck Yee Soo, Chen Lin Kho, Chui Ping Nyanti, Lee Sim, Siong Fong Lee, Karen Suan Ping Ganyai, Tonny Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir |
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Though more large tropical reservoirs are being constructed to meet the increasing energy demand, knowledge on the impact of damming a tropical river and the differences along the river after its impoundment is scarce. Thus, the present study aimed to increase our understanding of such differences both longitudinally and vertically. Water and sediment samples were collected at three different functional zones in the Murum river basin ten months after impoundment began. Results show that the impoundment has an impact on both the water and sediment. Longitudinal variations of water and sediment characteristics were observed at different functional zones. The upstream riverine zone which is subjected to anthropogenic activities serves as the main input of suspended solids and nutrients to the reservoir. The nitrogen changed from a high nitrate and low ammonia condition prior to impoundment to a low nitrate and high ammonia condition due to the accumulation of organic matter and slow nitrification rate after impoundment. In the transitional and lacustrine zones, vertical stratifications of dissolved oxygen and temperature were observed. The thickness of well-oxygenated column for sensitive aquatic organisms was only two meters at some stations. Water quality in all zones showed impairment during the filling phase as compared to the good water quality index before the impoundment. The reduction of suspended solids in the surface water column in the transitional and lacustrine zone is a positive change for aquatic organisms. Sediment characteristics were found to be distinct in the transitional zone where it was lower in sand, higher in silt, clay, organic carbon and nutrients in contrast to the riverine zone. Clay increased in all zones after the impoundment. There is an urgent need to reduce the pollutants input from the upstream riverine zone. |
format |
Article |
author |
Ling, Teck Yee Soo, Chen Lin Kho, Chui Ping Nyanti, Lee Sim, Siong Fong Lee, Karen Suan Ping Ganyai, Tonny |
author_facet |
Ling, Teck Yee Soo, Chen Lin Kho, Chui Ping Nyanti, Lee Sim, Siong Fong Lee, Karen Suan Ping Ganyai, Tonny |
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Ling, Teck Yee |
title |
Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir |
title_short |
Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir |
title_full |
Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir |
title_fullStr |
Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir |
title_full_unstemmed |
Changes in Water and Sediment Quality of a River Being Impounded and Differences among Functional Zones of the New Large Tropical Hydroelectric Reservoir |
title_sort |
changes in water and sediment quality of a river being impounded and differences among functional zones of the new large tropical hydroelectric reservoir |
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Bentus |
publishDate |
2019 |
url |
http://ir.unimas.my/id/eprint/26525/1/Soo%20Chen%20Lin.pdf http://ir.unimas.my/id/eprint/26525/ http://www.pjoes.com/ |
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