Estimating the Suspended Sediment Load and Evaluating the Homogeneity and Heterogeneity of Water and Sediment (Case Study: Kasilian watershed, Mazandaran)

Document Type : Research Article

Authors

1 Ph.D. Candidate at the Shahrekord University, Faculty of Natural Resources and Earth Science, Department of Natural Engineering, Shahrekord Unversity, Shahrekord, Iran

2 Assistant Professor, Faculty of Natural Resources and Earth Science, Department of Range and Watershed Management, Shahrekord Unversity, Shahrekord, Iran

3 Associated Professor, Faculty of Agriculture and Natural Resources, Department of Range and Watershed Management, Mohaghegh-Ardabili Unversity,Ardabil, Iran

Abstract

There is a significant difference between the observed and simulated suspended sediment yield with respect to many watersheds in Iran as this country does not have sediment stations. Due to station limitation, it is necessary to evaluate the experimental models and statistical methods for estimating the transfer rivers suspended sediment. The aim of this study is to evaluate homogeneity and heterogeneity, the trend of changes in discharge and sediment value and assesses a suitable comparison of suspended sediment load estimation methods efficiency using rating curves. The present study, the ProUCL software was used through the Kendall and Pitt test to evaluate trend changes and homogeneity and heterogeneity of time series relating to water and sediment discharge, respectively. To estimate suspended sediment a one-line, two-line, and mean-load rating curves were used. The performance of the methods was evaluated based on R2, NSE, RMSE and SD and the best method was selected. The finding of this study suggested that the mean-load method was selected as an appropriate method with the highest efficiency in the study area. Further, the trend changes of water and sediment discharges using the Kendall test showed that the trend is declining with a significance level of 5% and indicated that there are adaptations between water and sediment discharge changes. Pittet test revealed that the discrete time series in related to water and sediment discharges are homogeneous and heterogeneous, respectively. Therefore, having knowledge about the homogeneity and heterogeneity of water and sediment discharge can be effective in protection measures and environmental effects moderation.

Keywords

References

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Iranian journal of Ecohydrology
Volume 7, Issue 4
January 2021
Pages 1099-1112

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History

  • Receive Date: 11 June 2020
  • Revise Date: 03 November 2020
  • Accept Date: 03 November 2020
  • First Publish Date: 18 December 2020
  • Publish Date: 21 December 2020

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