Relationship for Thrust and Thickness of Stone Pitching Along Side of River

International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue VIII, August 2018 | ISSN 2321–2705

Relationship for Thrust and Thickness of Stone Pitching Along Side of River

 Dr. Birendra Kumar Singh

 Civil Engineering Department, Birla Institute of Technology, Mesra, Ranchi-835215 (Jharkhand), India

Abstract:-As discharge of flow increases in river, the thickness of stone pitching alongside of bank of river increases. The thickness of stone pitching provided alongside of river obtained from lateral thrust taking mean velocity of flow into account provides more thickness of stone pitching alongside of the river compared to the lateral thrust obtained from mean depth of flow. The equations for lateral thrust taking into account the velocity of flow and depth of flow with thickness of stone pitching provided alongside of the river are derived.

Keywords – Lateral thrust; Mean Velocity of flow; Thickness of stone pitching; Mean depth of flow; Flume.

I. INTRODUCTION

The relationship between the lateral thrust and thickness of stone pitching alongside river is analyzed. The thickness of stone pitching obtained from lateral thrust taking mean velocity of flow into account is determined. It is compared with the thickness of stone pitching obtained from the lateral thrust taking mean depth of flow into account.

II. EXPERIMENTAL SETUP & PROCEDURES

Data were obtained for 0.75-inch roughness bed.

Flume – The flume is open and 1.168m wide and 9.54m long. Roughness bed was constructed by smearing masonite boards with fiberglass resin. The boards were then screwed to the bed of the flume.

Experimental Procedure – Five to seven flows were measured for three different slopes (2, 5 and 8%). At each flow, depth was gaged at a single cross section, so that mean flow and channel properties could be calculated.

III. RESULTS AND ANALYSIS

Corresponding to average value of mean velocity of flow from 0.75-inch roughness bed i.e.

V = 0.590 m/sec, Q_m = 0.04047 m³/sec, Q_p =7798 m³/sec using

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