Flow Characteristics. New River Beach Protection Revetment Structure - Concrete Ma Cha Group

The concrete abatise groups frame as an advanced technique is used in flood protection, river regulation and bank protection works. To meet the necessity of engineering practice, this thesis carries out a research on the flow characteristics of the concrete abatise groups. After summarizing the present methods of bed resistance research, on the base of theoretic analysis, the contents, technical analysis and methods of the research are decided.According to the flume experiment, the laws of the flow resistance of the bed protected by abatise groups are explored and the roughness is calculated. Furthermore, in order to probe into the influence of abatise groups towards the flow structure, the vertical velocity distribution is measured. The effect of river bottom protection of abatise groups is defined as a index number n by competent velocity. Combining the results of the analysis on the bed resistance, the velocity distribution and the rules of index number n. ' s changing, the mechanism of the abatise groups' beach protection and accretion promotion effect is sought. The result indicates that the conclusions of the thesis are reasonable and reliable and the index number n is effective for engineering application.