Investigation of Hydraulical and Chemical Behavior of Dual Drain Envelopes (Organic and Synthetic) in Paddy Conditions with Two Different Water Qualities | ||
| تحقیقات آب و خاک ایران | ||
| Article 5, Volume 46, Issue 1, April 2015, Pages 31-39 PDF (546.24 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22059/ijswr.2015.54293 | ||
| Authors | ||
| Ehsan Ghane1; Maryam Navabian* 2; Mehdi Esmaeili Varaki2; Amir Malekpor Estalki2 | ||
| 1MSC Student, Water Engineering Department, Agricultural Sciences Faculty, University of Guilan | ||
| 2Assistant Professor, Water Engineering Department, Agricultural Sciences Faculty, University of Guilan | ||
| Abstract | ||
| Drain envelopes play significant roles in the performance of drainage systems due to their reduction in letting sediments into the drainpipes and also because of an increase in the hydraulic conductivity of soil around the drainpipes. Throughout the present research, the effect of a one 1000 hour flow on dual envelopes consisting of geotextile as a means of improving the hydraulic gradient and rice husk as bio-sorbent, on the hydraulic and chemical trends under paddy field conditions, with no rice crop, was considered. Towards this end, a drainpipe covered with two different thicknesses of geotextile at a depth of 40 cm was installed on a physical model. Then the drain pipe was filled, using a 5 cm thickness of rice husk. A thousand hour flow test, under two different water qualities of 0.7 and 1.9 dS/m was carried out, and while flow of drainage, EC, sodium absorption ratio and pH of drained water being assessed. Results showed that the reduction of flow rate of treatments of rice husk & thin geotextile with saline water (RNs), rice husk & thin geotextile with water of ordinary quality (RN), rice husk & thick geotextile with ordinary water quality (RV), as well as rice husk & thick geotextile with saline water (RVs) were 44, 94, 21 and 75 percent, respectively. But, in total, RN and RNs treatments presented the maximum and minimum cloggings, respectively. Thickness of geotextiles affected the flow rate and chemical trends, while the performance of rice husk, for all treatments, and in saline conditions wasn’t appreciable. | ||
| Keywords | ||
| flow rate; Geotextile; Rice Husk; salinity; SAR | ||
| References | ||
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