TY - JOUR ID - 64149 TI - Estimation of the longitudinal dispersion coefficient using the dimensional analysis in surface water flows JO - Iranian Journal of Soil and Water Research JA - IJSWR LA - en SN - 2008-479X AU - MOHAMMADI GHALENI, MEHDI AU - Ebrahimi, Kumars AU - Omid, Mohammad Hossein AD - Researcher, Ministry of Power and Energy AD - University of Tehran Y1 - 2017 PY - 2017 VL - 48 IS - 4 SP - 759 EP - 769 KW - Empirical equations KW - Estimation KW - Pollution advection KW - river KW - Surface water streams DO - 10.22059/ijswr.2017.219737.667566 N2 - Longitudinal dispersion coefficient is one of the most important parameters for the solution of the advection-dispersion equation. In this paper a new equation for predicting the longitudinal dispersion coefficient in surface water streams is presented. To archive this aim, a collection of 176 sets of measured field data from different canal and rivers were used, involving the dimensional analysis. Then the performance of the new equation was compared with 18 selected of well-known empirical equations, using the above mentioned data. The results show that the new equation has a twice precision in contrast to the other equations. In the other words, the calculated of the average percentage errors between the predicted and measured data for the proposed new equation was less than ±100 percent. Also, the mean absolute error and root mean square for the new equation were obtained equal to 0.34 and 0.03, respectively, which are less than other equations. UR - https://ijswr.ut.ac.ir/article_64149.html L1 - https://ijswr.ut.ac.ir/article_64149_744992088a6150ca017249a05de66569.pdf ER -