مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

This study looks into the impacts of Sarawak Barrage (located in Kuching City, State of Sarawak, Malaysia) flushing and flooding-in operations on upstream total suspended solids (TSS). Water samples were collected from three upstream stations on 17י", 181h and 191h of August 2000. During flushing, it was observed that TSS levels increased over a distance of II km upstream. Maximum TSS recorded 250 mgIL at 1.5 km, 120 mgIL at 6 km, and 85 mgIL at II km upstream. During flushing, TSS levels increased with depth, and upstream turbulence intensities were indirectly proportional to distance from barrage. During flooding-in operation, TSS decreased from 249 to 155 mg/L at 1.5 km near the bottom, while surface TSS decreased from 86 to 58 mgIL. Generally, during flooding-in operation, TSS increased from 90 to 116 rng/L between 6 and II km. During flooding-in operation, maximum bottom TSS recorded 216 mglL at 6 km upstream. Differences between bottom and mid-depth TSS levels were relatively minimal ranging from 19 to 45 mg/L, whilst the maximum difference between mid-depth and surface TSS was as high as 78 mgIL. After 9 hours of gate closure, a well-mixed regime prevailed from 6 to II km upstream with TSS ranged from 35 to 47 mgIL at all the monitoring points regardless of depths.