Calculation of Maximum Flow by the Regional Coefficients

Abstract

The purpose is to calculate regional flow modulus coefficients and their zoning along the entire length of the watercourses under study. Materials and methods. The calculation results presented in the monograph of scientific summaries of data on regime of water bodies and reference data of Hydrometeorological Service (series of observations of maximum water discharges) served as the initial materials. The total number of design sections was 56. The borrowed materials have been analyzed in order to reveal regular relations of hydrological and landscape-morphometric characteristics using the program of computer statistical data processing developed and registered by the authors of the article. Results and discussion. A detailed study of the array of points used to construct the dependence curve made it possible, for the studied basins of the Black Sea coast, to calculate regional coefficients (km), characterizing the formation of the maximum flow, by solving an inverse problem. Based on the coefficients obtained, zoning of the area was carried out. Within-basin ranking of the coefficients has also been carried out for the rivers showing a significant change in flow modulus in the flow direction. Verification of the validity of the obtained data was confirmed by the runoff modulus curve at P = 1 %, which showed a high correlation relationship. Comparison of reference water discharge values at P = 1 % with calculated values taking into account obtained coefficients has been made. Conclusions. It was found that when using regional coefficients in calculating the maximum flow, the error, on average, does not exceed 10 %. It means that application of the received coefficients will allow performing calculations of the given parameter with higher accuracy.