Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level

Determining the water quality of Bakun Reservoir 13 months after it operates at full supply level is crucial for better understanding of changes in the physicochemical parameters, which may enable the prediction of its effects on the survival of aquatic life in the reservoir. This study determined...

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Main Authors:	Teck, Yee Ling, Lee, Nyanti, Theresa, Muan, Jongkar Grinang, Siong, Fong Sim, Aazani Mujahid
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2016
Online Access:	http://journalarticle.ukm.my/9668/ http://journalarticle.ukm.my/9668/ http://journalarticle.ukm.my/9668/1/01_Teck_Yee_Ling.pdf

id	ukm-9668
recordtype	eprints
spelling	ukm-96682016-12-14T06:50:29Z http://journalarticle.ukm.my/9668/ Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level Teck, Yee Ling Lee, Nyanti Theresa, Muan Jongkar Grinang, Siong, Fong Sim Aazani Mujahid, Determining the water quality of Bakun Reservoir 13 months after it operates at full supply level is crucial for better understanding of changes in the physicochemical parameters, which may enable the prediction of its effects on the survival of aquatic life in the reservoir. This study determined 13 physicochemical parameters at six stations within the reservoir at fixed depths. The results showed that the minimum 5 mg/L of dissolved oxygen (DO) required for sensitive aquatic organisms was recorded at 6 m depth. However, DO was not detectable at depths exceeding 7 m. The water was acidic at depths of more than 10 m. Turbidity and total suspended solids increased corresponding with depth. Inorganic nitrogen were predominantly in the form of ammonia-nitrogen, creating an unhealthy environment for aquatic life. Concentration of Chl-a was significantly higher at the subsurface water than 30 m depth in four out of six stations. The present study shows changes in water quality as compared to the pre-impounded period and 15 months after the filling phase, in particular, stratification of dissolved oxygen, thermocline conditions and alkalinity. The changes varied according to the distance from the dam and may have been influenced by existing land developments within the area such as the construction of the Murum Hydroelectric Dam, oil palm plantations and timber concessionares. Though the water quality might have deteriorated, further study is needed to determine if this condition will prolong. Universiti Kebangsaan Malaysia 2016-02 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/9668/1/01_Teck_Yee_Ling.pdf Teck, Yee Ling and Lee, Nyanti and Theresa, Muan and Jongkar Grinang, and Siong, Fong Sim and Aazani Mujahid, (2016) Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level. Sains Malaysiana, 45 (2). pp. 157-166. ISSN 0126-6039 http://www.ukm.my/jsm/malay_journals/jilid45bil2_2016/KandunganJilid45Bil2_2016.html
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	Determining the water quality of Bakun Reservoir 13 months after it operates at full supply level is crucial for better understanding of changes in the physicochemical parameters, which may enable the prediction of its effects on the survival of aquatic life in the reservoir. This study determined 13 physicochemical parameters at six stations within the reservoir at fixed depths. The results showed that the minimum 5 mg/L of dissolved oxygen (DO) required for sensitive aquatic organisms was recorded at 6 m depth. However, DO was not detectable at depths exceeding 7 m. The water was acidic at depths of more than 10 m. Turbidity and total suspended solids increased corresponding with depth. Inorganic nitrogen were predominantly in the form of ammonia-nitrogen, creating an unhealthy environment for aquatic life. Concentration of Chl-a was significantly higher at the subsurface water than 30 m depth in four out of six stations. The present study shows changes in water quality as compared to the pre-impounded period and 15 months after the filling phase, in particular, stratification of dissolved oxygen, thermocline conditions and alkalinity. The changes varied according to the distance from the dam and may have been influenced by existing land developments within the area such as the construction of the Murum Hydroelectric Dam, oil palm plantations and timber concessionares. Though the water quality might have deteriorated, further study is needed to determine if this condition will prolong.
format	Article
author	Teck, Yee Ling Lee, Nyanti Theresa, Muan Jongkar Grinang, Siong, Fong Sim Aazani Mujahid,
spellingShingle	Teck, Yee Ling Lee, Nyanti Theresa, Muan Jongkar Grinang, Siong, Fong Sim Aazani Mujahid, Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level
author_facet	Teck, Yee Ling Lee, Nyanti Theresa, Muan Jongkar Grinang, Siong, Fong Sim Aazani Mujahid,
author_sort	Teck, Yee Ling
title	Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level
title_short	Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level
title_full	Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level
title_fullStr	Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level
title_full_unstemmed	Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level
title_sort	physicochemical parameters of bakun reservoir in belaga, sarawak, malaysia, 13 months after reaching full supply level
publisher	Universiti Kebangsaan Malaysia
publishDate	2016
url	http://journalarticle.ukm.my/9668/ http://journalarticle.ukm.my/9668/ http://journalarticle.ukm.my/9668/1/01_Teck_Yee_Ling.pdf
first_indexed	2023-09-18T19:55:22Z
last_indexed	2023-09-18T19:55:22Z
_version_	1777406493802364928

Physicochemical parameters of Bakun Reservoir in Belaga, Sarawak, Malaysia, 13 months after reaching full supply level

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