Sonic depth sounder for laboratory and field use

Abstract

Data obtained______ _ ____________ 5 Introduction.__ _________________ 1 Sonic depth sounder for field Description and specifications ________ 3 use______________________________ 6 Operation____ ___________________ 5 References___________ --____ 7 ILLUSTRATIONS Figure 1. Forms of bed roughness in allyvial channels _____ --___ --.