Grain size spectrum and textural parameters for the fluvial sediment bed in seven tropical rivers of Kelantan, Malaysia are presented in this article. The samples were collected from six tributaries to the main Sungai Kelantan spanning approximately 248 km stretch of water streams. Sand or gravel dominated river was identified for each river using the sediment composition analysis. Textural pattern shows complicated profiles of mean size and no consistent decreasing grain size and gradation parameter were observed towards the downstream flow. Most of the samples fall under the category of either very poorly sorted or poorly sorted and has very platykurtic kurtosis distributions. CM diagram (C=one percentile in microns and M = median grain size in microns) suggested that the deposition of fine-grained sediment for samples with median grain size d50 <1 mm are either by rolling, rolling and saltation or saltation and suspension.
This study investigates the relationship between land use types and sedimentary characteristics of fluvial bed at three
rivers in Selangor, Malaysia; namely Sungai Tengi, Selangor and Langat. The diversity in population density and land
development at the adjacent river banks gives associated dominant land use type as forest, agriculture and urban for
Tengi, Selangor and Langat, respectively. Field sampling was conducted at consistent spatial locations for Tengi and
Selangor, whereas for Langat, the bed sediment was taken at non-uniform spatial points due to limited access. Statistical
analysis of the sediment bed mixture shows that forest dominated land gives finer bed sediment size at < 200 µm.
Agriculture-type of land use increases the mean sediment size to medium sand, whereas bed material near to urbanized
areas has coarser sediment size with > 650 µm. Correlation analysis proved that there is a relationship between types
of land use with the mean sediment size. No distinctive correlation can be observed for sorting, skewness and kurtosis
of the sediment with the types of land use.
This study investigates the textural characteristics of sediments collected at eroded and deposited areas of highly severed eroded coastline of Batu Pahat, Malaysia. Samples were taken from systematically selected 23 locations along the 67km stretch of coastline and are extended to the fluvial sediments of the main river of Batu Pahat. Grain size distribution analysis was conducted to identify its textural characteristics and associated sedimentary transport behaviours. Sediments obtained along the coastline were fine-grained material with averaged mean size of 7.25 ϕ, poorly sorted, positively skewed and has wide distributions. Samples from eroded and deposition regions displayed no distinctive characteristics and exhibited similar profiles. The high energy condition transported the sediments as suspension, mostly as pelagic and the sediments were deposited as shallow marine and agitated deposits. The fluvial sediments of up to 3km into the river have particularly similar profile of textural characteristics with the neighbouring marine sediments from the river mouth. Profiles were similar with marine sediments about 3km opposite the main current and can go up to 10km along the current of Malacca Straits.