L'influence du climat sur la composition chimique des eaux souterraines vadoses

Schoeller, Henri

doi:10.2113/gssgfbull.s5-xi.7-9.267

Cited by 17 publications

(10 citation statements)

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“…Lastly, the effects of groundwater evapotranspiration are intentionally disregarded due to the deep groundwater table depth in the research region. Groundwater evapotranspiration becomes relevant only when the groundwater table depth is smaller than the ultimate evapotranspiration depth [40,41]. In such situations, future studies should consider groundwater evapotranspiration, and corresponding calculation formulas should be refined for a more comprehensive analysis.…”

Section: Discussionmentioning

confidence: 99%

Simulation of Irrigation Strategy Based on Stochastic Rainfall and Evapotranspiration

Long,

Wang,

et al. 2023

Agronomy

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The North China Plain plays a pivotal role in China’s crop production, contributing to 30% of the maize yield. Nevertheless, summer maize in this region faces challenges due to climatic constraints characterized by concurrent high temperatures and rainfall during the growing season, resulting in a relatively high evapotranspiration rate. In this study, we explored eight soil moisture-based threshold irrigation strategies, consisting of two upper limits and four lower limits, along with a rainfed mode (E). The upper and lower irrigation limits are expressed as a percentage of the field’s water-holding capacity (sfc). For the four full irrigation modes (A1, A2, A3, A4), the lower limits were set at 0.6 sfc, 0.6 sfc, 0.5 sfc, and 0.5 sfc, respectively. The upper limits were defined at two levels: 0.8 sfc for A1 and A2 and sfc for A3 and A4. Similarly, for the four deficit irrigation modes (B1, B2, B3, B4), the lower limits were established at 0.4 sfc, 0.4 sfc, 0.3 sfc, and 0.3 sfc, respectively, with the upper limits set at two levels: 0.8 sfc for B1 and B2 and the full sfc for B3 and B4. To investigate the impact of rainfall and potential evapotranspiration on these irrigation modes under long-term fluctuations, we employed a stochastic framework that probabilistically linked rainfall events and irrigation applications. The Monte Carlo method was employed to simulate a long-term series (4000a) of rainfall parameters and evapotranspiration using 62 years of meteorological data from the Xinxiang region, situated in the southern part of the North China Plain. Results showed that the relative yield and net irrigation water requirement of summer maize decreased with decreasing irrigation lower limits. Additionally, the interannual variation of rainfall parameters and evapotranspiration during the growing season were remarkable, which led to the lowest relative yield of the rainfed mode (E) aligned with a larger interannual difference. According to the simulation results, mode A4 (irrigation lower limit equals 0.5 sfc, irrigation upper limit equals 0.8 sfc) could be adopted for adequate water resources. Conversely, mode B2 is more suitable for a lack of water resources.

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Section: Discussionmentioning

confidence: 99%

Simulation of Irrigation Strategy Based on Stochastic Rainfall and Evapotranspiration

Long,

Wang,

et al. 2023

Agronomy

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“…By definition, the BEI is the ratio of the concentration of exchanged ions to the concentration of ions of the natural water originally existing species. It is obtained from the following equation (Schoeller, 1956): If the BEI is negative then the Ca 2+ and Mg 2+ ions in solution are exchanged against the K + and Na + from the geological formations; if the BEI is positive then the Na + and K + ions of the water are replaced by Mg 2+ and Ca 2+ ions from the rock matrix; if the BEI is nil, then there is a balance between the chemical composition of the water and the reservoir rock.…”

Section: Methodsmentioning

confidence: 99%

Chemical characterization and assessment of surface waters’ suitability for irrigation in the mid-Seybouse wadi plain (North-Eastern Algeria)

Mouassa

Chaab

Moulla

et al. 2018

MEQ

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Purpose The present study is undertaken in the region of Guelma that is located in North-Eastern Algeria. Guelma’s agricultural plain is irrigated from the Seybouse ephemeral river (wadi). The latter collects the entire domestic and industrial wastewaters of the region that are discharged without prior treatment. Hence, the organic and biological or what so ever contributions to the wadi are capable of initiating a significant degradation of its waters’ quality and challenging their use for irrigation. The paper aims to discuss these issues. Design/methodology/approach The interpretation of the results of three sampling campaigns for chemical and bacteriological analyzes was carried out in terms of the indices’ method (organic pollution index (OPI) and microbiological quality index (MQI)). The results were statistically assessed through the use of the principal component analysis (PCA). The OPI was calculated according to the method of Leclercq and Maquet (1987) whose principle is to classify the contents for the polluting elements into 5 classes each class corresponding to a given range for the considered parameter, and then to calculate the overall average class number for each sample. The MQI depends on the water concentrations in: the total coliforms, the fecal coliforms, and fecal streptococci. One defines five classes of concentrations for each of these parameters. The MQI is again the overall mean of the numbers for the classes for every parameter. Findings The OPI reflects a moderate pollution for most sampling stations. The PCA indicates that the variables controlling salinity are mainly Cl−, Na+ and SO42−. In August 2016, El-Fedjoudj pumping station shows a very strong fecal contamination. According to the recommendations of World Health Organization (1989), waters from wadi Seybouse cannot be used for the irrigation of vegetable crops if they were to be consumed raw. Originality/value This study has an environment impact as it reveals the need to protect surface waters used for irrigation and therefore protect consumers of raw vegetables that are to be consumed uncooked.

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“…The Na/Cl molar ratio of our groundwater samples ranges from 0.76 to 1.46. When ratios go below the theoretical seawater ratio of 0.86, it means that fresh groundwater has become polluted by the seawater exchanger (Schoeller 1956;Abdalla 2015;Tran et al 2020), i.e. inverse cation exchange takes place and Na + is taken by the exchanger.…”

Section: Simpson Ratio Contamination Degreementioning

confidence: 98%

An integrated seawater intrusion assessment in the Moroccan Ghiss-Nekor coastal aquifer using hydrogeochemical and geospatial techniques

BOURJILA

Dimane

GHALIT³

et al. 2023

Preprint

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Effective management of coastal aquifers requires a thorough understanding of seawater intrusion (SWI). The Ghiss-Nekor aquifer is one such area where the extent of SWI is unclear. This study aimed to map the extent of SWI using the hydrogeochemical approach combined to geospatial techniques. Accordingly, we coupled various geochemical indicators, including four ionic ratios (Cl/HCO3, SO4/Cl, Na/Cl, and Mg/Mg+Ca) and two SWI indices (GQIswi and SMI), with geospatial methods to generate a map highlighting the regions most prone to SWI. As a result, approximately 20% of the study area was impacted by SWI, with 70% of SWI spots found within 2 km of the shoreline. A saline water detected up to 5 km from the coast was interpreted, through the use of the aquifer's stratigraphic model, as being caused by the intrusion of seawater from the Souani area that is trapped in a deep clay-marly substratum. These promising findings highlight the effectiveness of the applied hydrogeochemical approach and offer crucial information regarding the extent of SWI. This information will aid decision-makers in the Al Hoceima region in creating efficient groundwater management plans to tackle the effects of climate change, especially the shortage of water resources caused by declining levels of precipitation.

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L'influence du climat sur la composition chimique des eaux souterraines vadoses

Abstract: Discusses the effect of climate on the chemical composition of ground waters. Variations in composition are correlated with the decrease in rainfall and the increase in average temperature from France to the Sahara, and depicted graphically.

Cited by 17 publications

References 0 publications

Simulation of Irrigation Strategy Based on Stochastic Rainfall and Evapotranspiration

Simulation of Irrigation Strategy Based on Stochastic Rainfall and Evapotranspiration

Chemical characterization and assessment of surface waters’ suitability for irrigation in the mid-Seybouse wadi plain (North-Eastern Algeria)

An integrated seawater intrusion assessment in the Moroccan Ghiss-Nekor coastal aquifer using hydrogeochemical and geospatial techniques

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