Statistical analysis of the SPI index and discharge potential of the Khansar Sarcheshmeh springs

Subject Areas : Water resource management

Babak Ebrahimi ¹ , Mehrdad Pasandi ² , Haniye Nilforoushan ³

1 - Regional Water Company of Esfahan, Isfahan, Iran
2 - Department of Geology, University of Isfahan, Isfahan, Iran
3 - Regional Water Company of Esfahan, Isfahan, Iran.

Received: 2023-12-02 Accepted : 2024-02-09 Published : 2024-03-10

Keywords: Drought, Spring, SPI, Khansar city ,

Abstract :

Planning the cultivation pattern and water rights allocation in the irrigated lands by the Khansar Sarcheshmeh springs requires knowledge of the discharge of the springs, estimated based on the Standard Precipitation Index (SPI) in this research. The relationship between the SPI index, precipitation, and discharges of Khansar Sarchesmeh springs has been evaluated over three different periods to estimate the groundwater resources and inflow to the streams. In a year with normal or near-normal climatic conditions and average annual rainfall between 295 to 494 mm, the average annual discharge of Sarcheshmeh springs is expected to be between 12.8 and 24.3 million cubic meters (average of 18.1 million cubic meters) with 67.5% probability and a frequency of 1.5 years based on the extreme value distribution. For a year with average dry climatic conditions (270 mm average annual rainfall), the predicted average annual discharge of Sarcheshmeh springs is 11.9 million cubic meters with a 9% probability and a frequency of 11 years. In extremely dry climatic years (with an occurrence frequency of 28 years), the discharge of Sarcheshmeh springs is expected to decrease to less than 10.1 million cubic meters per year. In normal and close to normal conditions, with average rainfall in the range of 236 to 326 mm in the first six months, the average annual (water year) discharge of Sarcheshmeh springs is expected to be 18.5 million cubic meters (ranging from 15.3 to 21.8 million cubic meters with a 67.5% probability based on the extreme value distribution). According to the results of this research, rainfall of less than 168 mm occurred in the first half of the water year is a warning of the occurrence of a moderate to extremely dry drought with an annual discharge of less than 11.6 million cubic meters that can be distributed in the streams. Precipitations of more than 394 mm during the first half of the water year also indicate the likelihood of a moderate to extremely wet year, with an annual rainfall of more than 28 million cubic meters. Results of the research indicate that less than 168 mm of rainfall in the first half of the water year signals the potential for a moderate to extremely dry drought, with an annual discharge of less than 11.6 million cubic meters that can be distributed in the streams, while more than 394 mm of precipitation during the same period suggests the possibility of a moderate to extremely wet year with an annual rainfall of more than 28 million cubic meters.

References:

Abkhan Consulting Engineers (2013). Report on water resources balance of Golpayegan study area (4130), water resources balance update studies of the Namak Lake catchment. Iran Water Resources Management Company, basic studies of water resources, Ministry of Energy.
Barker, L.J., Hannaford, J., Chiverton, A., Svensson, C. (2016). From meteorological to hydrological drought using standarised indicators. Hydrol. Earth Syst. Sci. 20, 2483–2505. https://doi.org/10.5194/hess-20-2483-2016
Bloomfield, J.P., Marchant, B.P. (2013). Analysis of groundwater drought building on the standardised precipitation index approach. Hydrol. Earth Syst. Sci. 17, 4769–4787. https://doi.org/10.5194/hess-17-4769-2013
Bouabdelli, S., Meddi, M., Zeroual, A., Alkama, R. (2020). Hydrological drought risk recurrence under climate change in the karst area of Northwestern Algeria. J. Water Clim. Chang. 11(S1), 164-188. https://doi.org/10.2166/wcc.2020.207
Haslinger, K., Koffler, D., Schoner, W., Laaha, G. (2014). Exploring the link between drought and streamflow: Effects of climate-catchment interaction. Water Resour. Res. 50, 1-20. https://doi.org/10.1002/2013WR015051
Hughes, J.D., Petrne, K.C., Silberstein, R.P. (2012). Drought, groundwater storage and stream flow decline in southwestern Australia. Geophys. Res. Lett. 39, L03408. https://doi.org/10.1029/2011GL050797
Ljubenkov, I., Cindrić Kalin, K. (2016). Evaluation of drought using standardised precipitation and flow indices and their correlations on an example of Sinjsko polje. Građevinar 68(2), 135-143. https://doi.org/10.14256/JCE.1337.2015
McKee, T.B., Doeksen, N.J., Kleist, J. (1993). The relationship of drought frequency and duration on time scales, 8th Conference of Applied Climatology, American Meteorological Society, Boston MA, 179-184.
Romano, E., Del Bon, A., Petrangeli, E., Preziosi, E. (2013). Generating synthetic time series of springs discharge in relation to standardized precipitation indices: Case study in Central Italy. J. Hydrol. 507, 86-99. https://doi.org/10.1016/j.jhydrol.2013.10.020
Russo, T.A., Lall, U. (2017). Depletion and Response of Deep Groundwater to Climate-Induced Pumping Variability. Nat. Geosci. 10(2), 105–08. https://doi.org/10.1038/ngeo2883
Saada, N., Abu-Romman, A. (2017). Multi-site modelling and simulation of the standardized precipitation index (SPI) in Jordan. J. Hydrol. Reg. Stud. 14, 83–91. https://doi.org/10.1016/j.ejrh.2017.11.002
Stagge, J.H., Tallaksen, L.M., Gudmundsson, L., Van Loon, A.F., Stahl, K. (2015). Candidate distributions for climatological drought indices (SPI and SPEI). Int. J. Climatol. 35, 4027–4040. https://doi.org/10.1002/joc.4267
Uddameri, V., Singaraju, S., Hernandez, E.A. (2019). Is standardized Precipitation Index (SPI) a useful indicator to forecast groundwater droughts? — Insights from a Karst Aquifer. J. Am. Water Resour. Assoc. 55, 70–88. https://doi.org/10.1111/1752-1688.12698