Evaluation of Spatio-temporal Changes of Flow Duration Curve Seasonal Indexes (FDCSI) in Four Decades in Namak Lake Basin

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SHEIKH Z.; YAZDANI M.R.; MOGHADDAM NIA A.

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Journal: IRAN-WATER RESOURCES RESEARCH Year:2019 | Volume:15 | Issue:2 Page(s): 39-56

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Title

Evaluation of Spatio-temporal Changes of Flow Duration Curve Seasonal Indexes (FDCSI) in Four Decades in Namak Lake Basin

Author(s)

SHEIKH Z. | YAZDANI M.R. | MOGHADDAM NIA A. | Issue Writer Certificate

Keywords

Flow Duration CurveQ1

Hydrological DroughtQ1

Spatiotemporal TrendQ1

Hurst ExponentQ1

Namak Lake BasinQ1

Abstract

Low flow is an important component in investigating the available water, especially in arid regions, which is applied to manage hydrologic drought and to reduce its impacts. The spatiotemporal changes of Hydrological Drought phenomenon were investigated in Namak Lake Basin in the present study based on Flow Duration Curve Seasonal Indexes (FDCSI) including Q70, Q80, Q90, Q95 and Q99. For this purpose, 18 stations with the maximum long-term data (43 years) were selected and FDCSI values were extracted for summer (June to November) and winter (December to May). Nonparametric tests including Mann-Kendal, Modified Mann-Kendal, and Sen Slope Estimator were performed to determine the time trend. Furthermore, Hurst Exponent was applied to investigate the long-term memory. Based on Hurst results, most of the time series had memory but uniform patterns were not recognized for them. The significant decreasing trend was identified based on summer and winter seasonal indexes at 55-66% and 38-50% of the total stations, respectively. In addition, a slightly increasing trend was observed at 5-11% of study stations at a significant level of 95 and 99%. The evaluation of the results of seasonal indexes showed that summer flow experienced more serve drought due to lack of base flow during 1970-2012. Severe decline trend during the summer season might occur due to the temporal patterns of rainfall, increasing evapotranspiration, and finally, over-harvesting of surface and groundwater resources for agricultural purposes. Despite the drastic changes in topography, and climate and consequently hydrologic regime at the basin, the spatial distribution of observational trends showed that the declining trend was distributed homogeneously all over Namak Lake, except its northeastern part. Rainfall regime, inter-basin water transfer (IBT) projects, agricultural lands drainage, industrial and household wastewater have played an important role in the observed positive trend in the northeastern region of the basin during four decades. The results indicated the importance of considering seasonality in low flow indexes; which makes a better reflection of the role of the effective driving forces and as a result, optimum management of streamflow is achieved during the persistent dry periods.

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APA: Copy

SHEIKH, Z., YAZDANI, M.R., & MOGHADDAM NIA, A.. (2019). Evaluation of Spatio-temporal Changes of Flow Duration Curve Seasonal Indexes (FDCSI) in Four Decades in Namak Lake Basin. IRAN-WATER RESOURCES RESEARCH, 15(2 ), 39-56. SID. https://sid.ir/paper/100239/en

Vancouver: Copy

SHEIKH Z., YAZDANI M.R., MOGHADDAM NIA A.. Evaluation of Spatio-temporal Changes of Flow Duration Curve Seasonal Indexes (FDCSI) in Four Decades in Namak Lake Basin. IRAN-WATER RESOURCES RESEARCH[Internet]. 2019;15(2 ):39-56. Available from: https://sid.ir/paper/100239/en

IEEE: Copy

Z. SHEIKH, M.R. YAZDANI, and A. MOGHADDAM NIA, “Evaluation of Spatio-temporal Changes of Flow Duration Curve Seasonal Indexes (FDCSI) in Four Decades in Namak Lake Basin,” IRAN-WATER RESOURCES RESEARCH, vol. 15, no. 2 , pp. 39–56, 2019, [Online]. Available: https://sid.ir/paper/100239/en

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