Developing empirical formulae for scour depth in front of inclined bridge piers Razvijanje empirijske jednadžbe za dubinu podlokavanja ispred nagnutih stupova mosta


Gradjevinar, vol.75, no.3, pp.239-256, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 75 Issue: 3
  • Publication Date: 2023
  • Doi Number: 10.14256/jce.3507.2022
  • Journal Name: Gradjevinar
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, ICONDA Bibliographic, Metadex, Directory of Open Access Journals, Civil Engineering Abstracts
  • Page Numbers: pp.239-256
  • Keywords: artificial neural network, bridge piers, inclination angle, multilayer perceptron, pier scour, radial-basis neural network
  • Abdullah Gül University Affiliated: Yes


Because of the complex flow mechanism around inclined bridge piers, previous studies have proposed different empirical correlations to predict the scouring depth in front of piers, which include regression analysis developed from laboratory measurements. However, because these correlations were developed for particular datasets, a general equation is still required to accurately predict the scour depth in front of inclined bridge piers. The aim of this study is to develop a general equation to predict the local scour depth in front of inclined bridge pier systems using multilayer perceptron (MLP) and radial-basis neural-network (RBNN) techniques. The experimental datasets used in this study were obtained from previous research. The equation for the scour depth of the front pier was developed using five variables. The results of the artificial neural-network (ANN) analyses revealed that the RBNN and MLP models provided more accurate predictions than the previous empirical correlations for the output variables. Accordingly, analytical equations derived from the RBNN and MLP models were proposed to accurately predict the scouring depth in front of inclined bridge piers. Moreover, from the sensitivity analyses results, we determined that the scour depths in front of the front and back piers were primarily influenced by the inclination angle and flow intensity, respectively.