EVALUATION OF THE SHAPE AND SIZE OF THE BED MATERIALS USING SNEED AND FOLKS DIAGRAM
Main article
Abstract
Streams and rivers are critical components of the hydrological cycle. River flow can scour the beds, transport and deposit particles, and thus change the river sinuosity. They will become non-porous or impermeable if the grain is not preserved. Runoff water may immediately enter the river, increasing the water flow rate and causing a flood. The presence of grain particles in the river is critical because they can control the velocity of the water flow, especially during the wet season. This study aimed to examine the particle shapes and sizes of gravel bed materials in the upper, intermediate, and lower stream of the Lepoh River. For analysis, Sneed and Folk diagrams were used. This method has been advocated as the most appropriate method for presenting the shape of particles in an unbiased manner. Around 300-grain particles were collected from the river's upper, intermediate, and lower reaches. The frequency distribution of particles at a, b, and c of the axis was quantified to analyse the shape and size of the bed materials. The study concluded that bed material was classified as very coarse gravel with mostly bladed particles at a higher flow rate and the upper stream. The bed materials were classified as coarse gravel, and the particle shape was platy and bladed at the lower part of the river due to the lower elevation.
