Assessment of Scouring of Bank of River

Abstract

The thrust of water due to standing water and velocity of flow are taken. In flood cases, more depth of water and more velocity are to be taken and it is seen whether the embankment is safe or not. The maximum velocity of flow = 1.2 d taken where d is the depth of flow of water. The bearing strength of the soil of the embankment should be taken against the thrust of water. In flood scenarios, the safety of embankments against the thrust of water becomes crucial. The thrust force exerted by standing water and flowing water depends on factors such as depth and velocity. During floods, the depth of water increases significantly, and higher velocities are observed, which results in greater forces acting on the embankment. It is essential to analyze whether the embankment can withstand these forces and remain stable. To determine the maximum velocity of flow during flood events, a commonly used approach is to assume a relationship with the depth of water. The maximum velocity can be estimated as 1.2 times the depth of flow (V = 1.2 d), where ‘V’ represents the velocity and ‘d’ represents the depth of water. This relationship provides a conservative estimate and considers the increased flow rates associated with higher water depths. The bearing strength of the embankment soil is a critical factor in assessing its stability against the thrust of water. The embankment soil should have sufficient shear strength to resist the horizontal forces induced by the water. Geotechnical investigations play a vital role in determining the bearing strength through laboratory tests and site-specific soil analysis. The results obtained from these investigations are used to assess the embankment’s capacity to withstand the forces exerted by the water. In the analysis process, the thrust force exerted by the water against the embankment is calculated using appropriate methods. The choice of method depends on factors such as the flow characteristics and complexity of the analysis. Common approaches include the hydrostatic pressure approach, which considers the pressure distribution due to the water’s weight, and the momentum principle, which accounts for the dynamic effects of flowing water.