Long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia

The project ‘Research and Training on Irrigation with Saline Water in Tunisia’, with the project report published by UNESCO in 1970, was set up to specify Tunisian standards for the use of saline water and to mitigate their effects on crop yields. The objective of this study is to assess the risk of...

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Autores principales:	Sabri Kanzari, Rim Jaziri, Khouloud Ben Ali, Issam Daghari
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	hydrus-1d irrigation parameter estimation saline water soil salinization tunisia Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/fa32ca82f3544a0fb2afc8a7a1dee876
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spelling	oai:doaj.org-article:fa32ca82f3544a0fb2afc8a7a1dee8762021-11-06T07:19:32ZLong-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia1606-97491607-079810.2166/ws.2021.052https://doaj.org/article/fa32ca82f3544a0fb2afc8a7a1dee8762021-08-01T00:00:00Zhttp://ws.iwaponline.com/content/21/5/2463https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798The project ‘Research and Training on Irrigation with Saline Water in Tunisia’, with the project report published by UNESCO in 1970, was set up to specify Tunisian standards for the use of saline water and to mitigate their effects on crop yields. The objective of this study is to assess the risk of long-term soil salinization by considering the agricultural practices mentioned in the project for the ‘Water Quality’ experiment in the semi-arid region of Cherfech (Tunisia). A Hydrus-1D model was used to simulate the movement of water and the transfer of salts. Soil hydraulic and solute transport parameters were estimated using inverse modeling. Calibration and validation of the model were made for the water and salt profiles carried out with four irrigation qualities QA, QB, QC and QD. Four scenarios over 50 years were studied: (i) S1 with rainfall (400 mm) only; (ii) S2 with rainfall and irrigation (1,400 mm); (iii) S3 with a 2 °C increase in temperature; (iv) S4 with the addition of 100 mm·d−1 of rainfall. The four scenarios highlighted the high risk of soil salinization, especially for the QB, QC and QD qualities after 20 years of irrigation and the deep dynamics of water and salts beyond the root zone which increases the risk of groundwater salinization. HIGHLIGHTS Saline water in Tunisia is a significant constraint on development.; The UNESCO project report Research and Training on Irrigation with Saline Water in Tunisia of 1970 is the only local reference for decision makers.; Inverse modeling is an essential tool to estimate soil transport parameters.; Assessment of soil salinization under different climate change scenarios.; Use of saline water based on the project practices can lead to the destruction of agricultural soils after 20 years.;Sabri KanzariRim JaziriKhouloud Ben AliIssam DaghariIWA Publishingarticlehydrus-1dirrigationparameter estimationsaline watersoil salinizationtunisiaWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 5, Pp 2463-2476 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydrus-1d irrigation parameter estimation saline water soil salinization tunisia Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	hydrus-1d irrigation parameter estimation saline water soil salinization tunisia Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Sabri Kanzari Rim Jaziri Khouloud Ben Ali Issam Daghari Long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia
description	The project ‘Research and Training on Irrigation with Saline Water in Tunisia’, with the project report published by UNESCO in 1970, was set up to specify Tunisian standards for the use of saline water and to mitigate their effects on crop yields. The objective of this study is to assess the risk of long-term soil salinization by considering the agricultural practices mentioned in the project for the ‘Water Quality’ experiment in the semi-arid region of Cherfech (Tunisia). A Hydrus-1D model was used to simulate the movement of water and the transfer of salts. Soil hydraulic and solute transport parameters were estimated using inverse modeling. Calibration and validation of the model were made for the water and salt profiles carried out with four irrigation qualities QA, QB, QC and QD. Four scenarios over 50 years were studied: (i) S1 with rainfall (400 mm) only; (ii) S2 with rainfall and irrigation (1,400 mm); (iii) S3 with a 2 °C increase in temperature; (iv) S4 with the addition of 100 mm·d−1 of rainfall. The four scenarios highlighted the high risk of soil salinization, especially for the QB, QC and QD qualities after 20 years of irrigation and the deep dynamics of water and salts beyond the root zone which increases the risk of groundwater salinization. HIGHLIGHTS Saline water in Tunisia is a significant constraint on development.; The UNESCO project report Research and Training on Irrigation with Saline Water in Tunisia of 1970 is the only local reference for decision makers.; Inverse modeling is an essential tool to estimate soil transport parameters.; Assessment of soil salinization under different climate change scenarios.; Use of saline water based on the project practices can lead to the destruction of agricultural soils after 20 years.;
format	article
author	Sabri Kanzari Rim Jaziri Khouloud Ben Ali Issam Daghari
author_facet	Sabri Kanzari Rim Jaziri Khouloud Ben Ali Issam Daghari
author_sort	Sabri Kanzari
title	Long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia
title_short	Long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia
title_full	Long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia
title_fullStr	Long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia
title_full_unstemmed	Long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia
title_sort	long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of tunisia
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/fa32ca82f3544a0fb2afc8a7a1dee876
work_keys_str_mv	AT sabrikanzari longtermevaluationofsoilsalinizationrisksunderdifferentclimatechangescenariosinasemiaridregionoftunisia AT rimjaziri longtermevaluationofsoilsalinizationrisksunderdifferentclimatechangescenariosinasemiaridregionoftunisia AT khouloudbenali longtermevaluationofsoilsalinizationrisksunderdifferentclimatechangescenariosinasemiaridregionoftunisia AT issamdaghari longtermevaluationofsoilsalinizationrisksunderdifferentclimatechangescenariosinasemiaridregionoftunisia
_version_	1718443832518901760

Long-term evaluation of soil salinization risks under different climate change scenarios in a semi-arid region of Tunisia

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