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Sains Malaysiana 46(12)(2017): 2367–2374 http://dx.doi.org/10.17576/jsm-2017-4612-13
Assessing Water Quality of Murum Reservoir Halfway Through Impoundment
(Menilai Kualiti Air di Empangan Murum pada Separuh
Perangkuman)
ANGIE SAPIS1*, LEE NYANTI1, LING TECK YEE2, SIM SIONG FONG2
& JONGKAR GRINANG3
1Department of
Aquatic Science, Faculty of Resource Science and Technology, University of
Malaysia Sarawak, 94300 Kota Samarahan, Sarawak Bumi Kenyalang, Malaysia
2Department of
Chemistry, Faculty of Resource Science and Technology, University of Malaysia
Sarawak, 94300 Kota Samarahan, Sarawak Bumi Kenyalang, Malaysia
3Institute of
Biodiversity and Environmental Conservation, University of Malaysia Sarawak
94300 Kota Samarahan, Sarawak Bumi Kenyalang, Malaysia
Received: 16
November 2015/Accepted: 31 May 2017
ABSTRACT
This paper reports the water
quality of Murum Hydroelectric Reservoir, eight
months after impoundment of the dam. A total of nine stations were selected in
the reservoir. Temperature, pH, dissolved oxygen (DO),
biochemical oxygen demand (BOD5), chlorophyll-a and total suspended solids (TSS)
were studied. The results showed that the water was warmer at 0.5 m depth. As
the depth increased, temperature in the reservoir decreased in the range of
4.40°C to 7.35°C from 0.5 to 20 m depth. The concentration of DO dropped
to zero at 4 - 6 m depth leading to anoxic level. pH at 0.5 m depth ranged from
6.40 to 7.20 and they were significantly higher (p<0.05)
than those at 10 and 20 m. Chlorophyll-a at 0.5 m were in the range of 4.61 to
20.50 mg/L, relatively higher compared to 10 m and 20 m depths. The results obtained indicates that impoundment of Murum River generally caused water quality deterioration.
In addition, this could be due to anthropogenic activities such as plantation
and logging activities that are still going on within the catchment during the
impoundment. Therefore, further continuous monitoring and investigation is
required to determine the long-term water quality condition and identify
factors that influence water quality in Murum Reservoir.
Keywords: Early impoundment;
hydroelectric dam; Murum Dam; thermocline
ABSTRAK
Kertas ini melaporkan
kualiti air empangan
hidroelektrik Murum, lapan bulan selepas
perangkuman empangan. Sebanyak
sembilan stesen telah dipilih di dalam takungan. Suhu, pH,
oksigen terlarut (DO),
permintaan oksigen biokimia (BOD5), pepejal
klorofil-a dan
jumlah pepejal terampai (TSS) telah
dikaji. Keputusan
menunjukkan bahawa air lebih panas pada
kedalaman 0.5 m. Apabila
kedalaman meningkat, suhu dalam takungan
menurun dalam
lingkungan 4.40°C hingga
7.35°C daripada 0.5 hingga 20 m kedalaman. Kepekatan DO jatuh ke
sifar pada
kedalaman 4 - 6 m yang membawa
kepada tahap anoksik.
pH pada kedalaman
0.5 m adalah dari 6.40 hingga 7.20 dan mereka jauh lebih
tinggi (p<0.05) berbanding dengan 10 dan 20 m. Klorofil-a pada 0.5 m berada dalam lingkungan 4.61 hingga 20.50 mg/L, lebih tinggi berbanding dengan 10 dan 20 m kedalaman. Hasil yang diperoleh menunjukkan
bahawa perangkuman Sungai Murum secara amnya
menyebabkan kemerosotan
kualiti air. Di samping itu, ini
boleh disebabkan
aktiviti antropogenik seperti aktiviti perladangan dan pembalakan yang masih berlaku dalam semasa
perangkuman. Oleh itu,
pemantauan dan
penyelidikan yang berterusan
diperlukan untuk menentukan keadaan kualiti air jangka panjang dan mengenal
pasti faktor
yang mempengaruhi kualiti air di
Empangan Murum.
Kata kunci: Empangan
hidroelektrik; Empangan
Murum; perangkuman
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*Corresponding author; email: angiesapis@gmail.com
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