HYDRAULIC MODEL STUDIES FOR IRRIGATION STRUCTURES AND FOP- RIVER PROBLEMS

Abstract

In this Dissertation the author has attempted a clear exposition of the technique of Hydraulic Model Studies for Irrigation Structures and River Problems. After briefly tracing the. historical back ground of model studies, the basic theory involved the laws governing various phenomenon in different problems, have been discussed. The different types of models involving closed conduit flews, flaw with a free surface pertaining to hydraulic structures and rivers have been dealt ii ,,details. The different types of similitudes viz. Geometric, Kinematic and Dynamic similitudes and possibility of their attainments have been discussed. An important -=' aspect of the study is the deter-mination of suitable scale ratios for Mobile bed river models. Critical study of the Einstein & Chien's Rational Method and Lacey'! Empirical method of evaluating scales of river models have been made. Some ease studies have also been made to go into the details of the model scales fixed for some river problems experimented at field research. station Bahadrabad of Irrigation Research Institute Roorkee and Hydraulics laboratory of Civil Engineering Department of University of Roorkee. The field data needed for model studies, the processing of the data, construction of models with suitable materials and the process of verification of the model have been described in details. Some instances of model and prototype confdrmity have been quoted and the value of hydraulic model as a valuable tool with the engineers has been impressed. Lastly, the limitations of a distorted river model and care and Judgement required in :inter pretation of prototype behaviour from it has been pointed out and further scope of development in this field indicated.