Design of a hybrid ANN multi-objective whale algorithm for suspended sediment load prediction
Document Type
Article
Publication Date
1-1-2021
Abstract
There is a need to develop an accurate and reliable model for predicting suspended sediment load (SSL) because of its complexity and difficulty in practice. This is due to the fact that sediment transportation is extremely nonlinear and is directed by numerous parameters such as rainfall, sediment supply, and strength of flow. Thus, this study examined two scenarios to investigate the effectiveness of theartificial neural network(ANN) models and determine the sensitivity of the predictive accuracy of the model to specific input parameters. The first scenario proposed three advanced optimisers-whale algorithm (WA), particle swarm optimization (PSO), and bat algorithm (BA)-for the optimisation of the performance of artificial neural network (ANN) in accurately predicting the suspended sediment load rate at the Goorganrood basin, Iran. In total, 5 different input combinations were examined in various lag days of up to 5 days to make a 1-day-ahead SSL prediction. Scenario 2 introduced a multi-objective (MO) optimisation algorithm that utilises the same inputs from scenario 1 as a way of determining the best combination of inputs. Results from scenario 1 revealed that high accuracy levels were achieved upon utilisation of a hybrid ANN-WA model over the ANN-BA with an RMSE value ranging from 1 to 6%. Furthermore, the ANN-WA model performed better than the ANN-PSO with an accuracy improvement value of 5-20%. Scenario 2 achieved the highestR(2)when ANN-MOWA was introduced which shows that hybridisation of the multi-objective algorithm with WA and ANN model significantly improves the accuracy of ANN in predicting the daily suspended sediment load.
Keywords
Soft computing model, Whale algorithm, ANN, Suspended sediment load, Optimisation, Iran
Divisions
sch_civ
Funders
Institute of Postgraduate Studies and Research (IPSR) of Universiti Tunku Abdul Rahman
Publication Title
Environmental Science and Pollution Research
Volume
28
Issue
2
Publisher Location
TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY