COMPUTATIONAL ANALYSIS OF EFFECT OF WATER IMPURITY ON A RIVERBANK PARTICLE

Debasish Biswas, Arijit Dutta, Sanchayan Mukherjee, Asis Mazumdar

Doi: 10.26480/cic.01.2020.64.66

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

ABSTRACT:The continuous flow of water through a river makes the riverbank quite dynamic in nature. The stability of a riverbank surface depends on many factors, as the sediment particles of the riverbank are subjected to wide variety of forces and these forces, in turn, depend on numerous factors. Water impurity is one of the most significant among them. Again, water level in a riverbank system continuously changes with time. The change of the water level has a telling effect on the stability of a bank surface. In the present work microscopic analysis has been made to compute stability of the bank surface by considering both pure and impure (high-density) water and the varying water level for different volume of liquid entrapped between the particles. An already-published “Truncated Pyramid Model (TPM)” for particle arrangement has been used and the principle of angular momentum has been applied for determination of escape velocity or separation speed which is the key parameter to quantify the erodibility of the bank surface. Here, three volumes of liquid bridge have been considered (10 nl, 20 nl and 30 nl). And the effect of water impurity and entrapped water volume on escape velocity has been presented graphically vis-a-vis different inter-particle distances.

Keywords:Truncated pyramid model, Escape velocity, Inter-particle distance, Riverbank stability, Water impurity, Liquid-bridge volume