A Limnological Study Of Temengor Reservoir With Special Reference To The Aphotic Zone
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Date
2015-10
Authors
OMAR, NOR AISYAH
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Abstract
A monthly study was conducted to analyze the influence of seasonal change and water depths on physical and chemical processes in the water column of Temengor Reservoir from November 2011 until June 2012 to cover the dry (December 2011, January 2012, February 2012 and June 2012) and wet season (November 2011, March 2012, April 2012, and May 2012) based on the monthly rainfall distribution obtained. In this study, the physical parameters were taken in-situ whereas for chemical analysis, water samples from different depths (surface water, Secchi depth, 5 m, 10 m, 15 m and 20 m) of five sampling stations were collected. Based on the results, mean of Secchi depth ranged from 2.01 m to 2.31 m. For physical parameters such as water temperature, it ranged from 29.8 to 30.0ºC, dissolved oxygen ranged from 6.8 to 7.6 mg/L and pH ranged from 7.82 to 8.76. Roughly, the values for these three parameters were high at surface water but decreased gradually with depths. On the other hand, conductivity ranged from 0.033 to 0.039 mS/cm, total dissolved solids level ranged from 0.019 to 0.023 mg/L, concentrations of orthophosphate ranged from 0.022 to 0.059 mg/L, nitrate-nitrogen ranged from 0.015 to 0.028 mg/L, nitrite-nitrogen ranged from 0.0006 to 0.0016 mg/L and chlorophyll a ranged from 1.55 to 3.52 mg/L. These parameters were low at surface and increased with deeper water depths. The measured physical parameters except temperature (ºC) were slightly lower during wet season whereas the measured chemical parameters except nitrate-nitrogen were slightly higher during the dry season. Bathymetry study was conducted to map the benthic elevation of five
sampling stations in Temengor Reservoir. The maximum depth recorded was at Station 3 and Station 4 with 80 metres. Based on the findings of measured physical and chemical parameters from this study, Temengor Reservoir can be classified as a mesotrophic lake. A solid ecological foundation can achieve the utmost operation of Temengor Reservoir. Improvement of in-depth research works studying the eco-hydrological process of Temengor Reservoir would provide a basic tool necessary to frame a better management, restoration and conservation programme.
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A Limnological Study Of Temengor Reservoir , With Special Reference To The Aphotic Zone