Channel profiles and hydrodynamics of streams and lake at the Loagan Bunut National Park, Sarawak
2006
M. Murtedza | N. Bessaih | Wan Sulaiman W.H. | A.K. Sayok | E. Efransjah
The ca. 650 ha Loagan Bunut represents the largest and hydrologically least understood peat swamp fed freshwater body in Sarawak. A study, carried out to establish the basic hydrological of the Loagan Bunut National Park (LBNP), revealed the extreme importance of preserving the peat swamp forest (PSF) surrounding the lake and the need to prudently manage the upstream catchment of Sg. Teru in order to sustain the hydrological integrity of the lacustrine environment. Depending on the rainfall distribution, the Loagan Bunut is fed either by the discharge from the PSF or by the inflow from Sg. Teru via Sg. Loagan Bunut. On occasions when there is substantial rainfall within the LBNP sub-catchment, the lake water will be replenished and sustained over a certain period by the previously recharged groundwater in the surrounding PSF. During extended dry periods and in the absence of groundwater recharge in the Loagan Bunut sub-catchment, the lake water will recede or even completely dry up through evaporation loss and discharge into Sg. Teru via Sg. Bunut. Under such condition, the lake may receive flood discharges from Sg. Teru. The duration of flood within the lake (in either case) would depend on the water level of Sg. The lake water would be readily emptied downgradient into Sg. Teru on occasions when the water level in the latter is lower than that in Sg. Bunut. With regard to the Sg. Tinjar water, the prevailing steep streambed gradient of Sg. Teru at the confluence with Sg. tinjar will not likely render a reversal of flow into Sg. Teru.
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