Management of Natural Ecosystems

Management of Natural Ecosystems

Investigation of acidity status of different water sources using geostatistical methods (Case study: Sirjan plain of Kerman province)

Document Type : Original Article

Authors
alireza shasavaripoor 1
alijan abkar 2
Hamzeh saeediyan 2
1 Senior expert in watershed management in agricultural jihad management of Sirjan city.
2 Assistant Professor, Department of Soil Conservation and Watershed Management Research, Kerman Agricultural and Natural Resource Research Center, Agricultural Research, Education and Extension Organization, Kerman, Iran.
10.22034/emj.2024.714956
Abstract
One of the important parameters that is carefully analyzed in different aquifers of watersheds is the water acidity that due to the high importance of acidity and alkalinity of water resources in human and livestock drinking water. In this research, the acidity level of 55 water sources in the Sirjan plain aquifer was studied. Then, geostatistical methods such as inverse distance weight (IDW), normal distance weight (NDW), ordinary krigin (OK) were used for zoning of water acidity. indicators of Coefficient of determination (R2), root mean square error (RMSE), Mean Square Error (MSE), mean absolute error (MAE), correlation coefficient (R) and coefficient Nash - Sutcliff (NS), were used to evaluate the estimation and prediction models. After selecting the best method of interpolation, spatial zoning maps related to water acidity were extracted fromArc GIS and GS+ software. The results of research showed that the total average of water in the investigated water resources in alluvial aquifer of Sirgan plain is 7.48382. Therefore, according to the total average of water acidity of Sirjan plain that is slightly higher than 7, therefore, the alkalinity of water is evident slightly in the studied water resources. The results of research also showed that the minimum water acidity is 6.08 that is related to the water source of Jafarabad region and the maximum water acidity is 8.8 that is related to the water source of Mohammad Kazem Yazdani - the airport and the rest of the water resources were placed between these two levels of acidity. ordinary kriging (OK) method was determined in terms of Coefficient of determination (R2), root mean square error (RMSE), Mean Square Error (MSE), mean absolute error (MAE), correlation coefficient (R) and coefficient Nash - Sutcliff (NS) was recognized the best method for evaluating semi-variogram fitted models for zoning for water acidity. The results of research showed that in the center and north of Sirjan plain, due to sewage caused by the population of Sirjan city and the density of agricultural lands and the use of some chemical fertilizers in a spot manner, the amount of water acidity increases compared to other parts of the plain, and this maximum increase is visible in around Sirjan city.
 
Keywords
Ordinary kriging
Index
Zoning
Aquifer
Subjects
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  • Receive Date 17 October 2023
  • Revise Date 03 April 2024
  • Accept Date 28 April 2024