Optimizing the riparian zone width near a river for controlling lateral migration of irrigation water and solutes

JOURNAL OF HYDROLOGY

卷:570

Article

Phogat, V.^1,2  Cox, J. W.^1,3  Kookana, Rai S.⁴  Simunek, J.⁵  Pitt, T.¹  Fleming, N.¹ 

[1] South Australian Res & Dev Inst, GPOB 39Z, Adelaide, SA 5001, Australia

[2] CCS Haryana Agr Univ, Hisar 125004, Haryana, India

[3] Univ Adelaide, PMB1, Glen Osmond, SA 5064, Australia

[4] CSIRO Land & Water, PMB 2, Glen Osmond, SA 5064, Australia

[5] Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA

关键词: Buffer width;    Irrigated crops;    HYDRUS;    Leaching;    Solute dynamics;    Water quality;   

DOI  :  10.1016/j.jhydrol.2019.01.026

来源: Elsevier

【 摘 要 】

Riparian zones are essential to preserve water quality of rivers adjacent to large areas of irrigated agriculture. We used HYDRUS (2D/3D) to quantify the long-term (8 years) influence of crops (almonds, wine grapes and potatocarrot) irrigated with recycled water on water and solute exchange at the Gawler River interface in relation to vegetation buffer widths from 10 to 110 m. We found that under almond and annual horticulture the likely average annual water flow from the irrigated area to the river was nearly twice as much (2.1 and 1.8, respectively) that under wine grapes. The hydraulic exchange at river interface for different irrigated crops was found to be sensitive to the buffer widths. For wine grapes, almonds and annual horticulture, the average annual hydraulic balance reached an equilibrium at 20, 65 and 55 m buffer widths, respectively. Furthermore, for wine grapes, with a 20 m buffer width, the average annual load of salts became negligible. This study shows that buffer widths of 20, 60, and 40 m for irrigated wine grapes, almond, and annual horticulture, respectively, are needed to restrict the migration of salts to the river. Further refinements are possible by incorporating the influence of preferential flow paths, improved water stress response functions, and addressing the data limitations for calibration of the model for solute dynamics.

【 授权许可】

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