Determination of deep infiltrate level of sediment in floodwater spreading fields (Case study: Gachsaran station)

Padyab, Mohsen; Feiznia, Sadat; Ahmadi, Hasan; Shafei, Ardeshir

doi:10.22059/jrwm.2015.53872

Document Type : Research Paper

Authors

¹ 1 PhD Student in Watershed Management, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran

² Professor, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran

³ Professor, Department of Watershed Management, Islamic Azad University, Tehran Science and Research Branch, I.R. Iran

⁴ Research Instructor, Research Centre for Agricultural and Natural Resources, Kohgiloye and Boyerahmad, Iran.

https://doi.org/10.22059/jrwm.2015.53872

Abstract

Evaluation of changes present in soil and water resources due to operation implement of floodwater spreading is necessary to assess their positive or negative resultant effect. Rate of the internal sediment to diversion spreader channels, surface sedimentation and aggregation of the spreading field depth are most important effective attributes on the yield of floodwater spreading systems. These factors can change physical and chemical properties of studied field, as, by measuring of the infiltrate depth sedimentation of can achieve influencing depth of floodwater. To determine the effect of flooding spread on the sediment infiltrate rate in the field depth of Gachsaran floodwater spreading, from 0-15, 30-15, 30-45 and 45-60cm of the soil surface of spreading field and control were sampled. Granulometry of all samples was done using dry sieve and hydrometric analysis and then percent of the sediment grains with size of less than two millimeters were subjected to analysis of variance (ANOVA) by Duncan t-student test for 80 sampled samples. Results showed that deep entering of the sediments into drilled profiles to 30-45cm was completely distinct which can affect on the soil physical and mechanical properties. However, after the 30-45cm depth, the impact of floodwater spreading was minimal. The infiltration of each studied layer is the most important feature which will change from surface to the depth of spreading belts, so that by increasing infiltrated fine particles in the depth and blocking pores, the soil layers are clogged and in result reduce the infiltration rate, sharply. This state was more remarkable in the spreader belts surface. Furthermore, by depositing the sediments in the surface (0-15cm depth), an impermeable and earthen layer is created which prevent from infiltrate the particles and even water into soil depth. Generally, with determine of the deposited sediment level in the spreading belts and also its deep infiltrate rate can provide effective and practical decision to improve efficiency and easy maintenance of the floodwater spreading systems or even not use this method.

Keywords

References

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Journal of Range and Watershed Managment

Determination of deep infiltrate level of sediment in floodwater spreading fields (Case study: Gachsaran station)

References

References

Volume 68, Issue 1 - Serial Number 1
June 2015
Pages 15-24

Determination of deep infiltrate level of sediment in floodwater spreading fields (Case study: Gachsaran station)

References

References

Volume 68, Issue 1 - Serial Number 1June 2015Pages 15-24

Volume 68, Issue 1 - Serial Number 1
June 2015
Pages 15-24