Modeling and predicting suspended sediment load under climate change conditions: a new hybridization strategy

被引:34
作者
Farzin, Saeed [1 ]
Valikhan Anaraki, Mahdi [1 ]
机构
[1] Semnan Univ, Dept Water Engn & Hydraul Struct, Fac Civil Engn, Semnan, Iran
关键词
climate change; flower pollination optimization algorithm; hybridization strategy; least-squares support-vector machine; suspended sediment loads;
D O I
10.2166/wcc.2021.317
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
In the present study, for the first time, a new strategy based on a combination of the hybrid least-squares support-vector machine (LS-SVM) and flower pollination optimization algorithm (FPA), average 24 general circulation model (GCM) output, and delta change factor method has been developed to achieve the impacts of climate change on runoff and suspended sediment load (SSL) in the Lighvan Basin in the period (2020-2099). Also, the results of modeling were compared to those of LS-SVM and adaptive neuro-fuzzy inference system (ANFIS) methods. The comparison of runoff and SSL modeling results showed that the LS-SVM-FPA algorithm had the best results and the ANFIS algorithm had the worst results. After the acceptable performance of the LS-SVM-FPA algorithm was proved, the algorithm was used to predict runoff and SSL under climate change conditions based on ensemble GCM outputs for periods (2020-2034, 2035-2049, 2070-2084, and 2085-2099) under three scenarios of RCP2.6, RCP4.5, and RCP8.5. The results showed a decrease in the runoff in all periods and scenarios, except for the two near periods under the RCP2.6 scenario for runoff. The predicted runoff and SSL time series also showed that the SSL values were lower than the average observation period, except for 2036-2039 (up to an 8% increase in 2038).
引用
收藏
页码:2422 / 2443
页数:22
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