Temporal Variability on Lowland River Sediment Properties and Yield

Abstract

Problem statement: A sediment analysis study was conducted at the Chini River on 16 and 31 August 2008. This study was conducted to review the formation of suspended sediment load in the Lake Chini catchment area, which flows into the Pahang River via the Chini River. Approach: Three sampling stations were chosen, the first one at upstream Chini River (S1), mid-stream Chini River (S2) and downstream Chini River (S3). Three parameters were quantified for this study, namely: distribution of sediment grain size (g), concentration of suspended sediment (mg L^-1) and river discharge values (in m³ sec^-1). Results: The findings of the study show that the sizes of sediment fall between phi Ø-2.00 with very rough particle sizes falling between phi^-1.00 and phi 0.00. At the study area, the daily discharge value is estimated at 722, 304, 00 L day^-1. The average suspended sediment concentration recorded for each station shows varying values for both timelines. The values were 27.33 mg L^-1 on 16/08/08 and 2.233 mg L^-1 on 31/08/08. Conclusion: The average value for all stations calculated based on the formation of suspended sediment load per day falls between 16,480.4627 kg day^-1 on 16/08/08 and 1,540.43 kg day^-1 on 31/08/08. Overall, when this number was extrapolated to every square kilometre, the result showed that the estimated average sediment that flows out of Lake Chini is 73.22 tonnes km^-2 year^-1.