Retrieval and interpretation of precipitation rates generated from the composition of the Merouane Chott ephemeral lake

Hacini, Messaoud; Oelkers, Eric H.; Kherici, Nacer

doi:10.1016/j.gexplo.2005.08.057

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…The Chott Merouane is located *31 m below sea level, the lowest location in northwest Africa. The annual geochemical and hydrologic evolution of this chott was characterized in detail by Guendouz et al (2003), Hacini et al (2006), and Hacini et al (2008). This chott is an outlet for the Terminal Complex aquifer, which brings in water from the north, west, and south.…”

Section: The Geology and Hydrology Of The Merouane Chottmentioning

confidence: 99%

Geochemistry and Behavior of Trace Elements During the Complete Evaporation of the Merouane Chott Ephemeral Lake: Southeast Algeria

Hacini

Oelkers

2010

Aquat Geochem

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The Merouane Chott, located in arid southeastern Algeria, experiences annual cycles of filling from September through February followed by its complete evaporation from February through June. The concentration of 15 trace elements (Li, B, Ti; V, Cr, Mn, Co, Cu, Ni, Zn, As, Sr, Ba, Pb, Bi, and U) were measured in chott water samples collected from January through June 2003 during the complete evaporation of the lake. The corresponding concentrations of these trace elements in the major external inputs to this closed basin chott were also obtained. The trace metals show two distinct behaviors. Li, B, Cr, Co, and U tend to be conserved in the chott waters throughout its evaporation. Much of Cr, Co, and U originated from external sources. It is likely, therefore, that the concentration of these elements will increase in the chott waters in future years. In contrast, Ti, Sr, Ba, Zn, Ni, and Pb precipitate continuously during chott evaporation. Of these elements, most of the Sr, Ba, and Zn originated from outside the chott, and thus it is likely these elements will become increasingly concentrated in the chott bottom salts with time. V, As, and Cu exhibit intermediate behaviors. These contrasting behaviors are confirmed by analysis of chott bottom solids.

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Section: The Geology and Hydrology Of The Merouane Chottmentioning

confidence: 99%

Geochemistry and Behavior of Trace Elements During the Complete Evaporation of the Merouane Chott Ephemeral Lake: Southeast Algeria

Hacini

Oelkers

2010

Aquat Geochem

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“…Multiplying the total precipitation by the maximum surface area of the Merouane Chott ephemeral lake yields a total annual rainwater volume of 4.9 Â 10 6 m 3 . The sum of these three annual average inputs is 198 Â 10 6 m 3 (Hacini et al, 2006). Of this total, assuming the groundwater springs flow at near constant rates and taking account of the flux of the Oued Righ canal during the fall and winter months, approximately 100 Â 10 6 m 3 of water is inputted to the Chott from October 1 to February 28, which is close to the total estimated February 2003 Chott lake volume of 92 Â 10 6 m 3 .…”

Section: The Geology and Hydrology Of The Merouane Chottmentioning

confidence: 54%

Mineral precipitation rates during the complete evaporation of the Merouane Chott ephemeral lake

Hacini

Kherici

Oelkers

2008

Geochimica et Cosmochimica Acta

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“…The largest chotts of Algeria include Chotts Merouane and Melrhir (Figure 2) [64]. Moreover, Algeria's large chotts include multiple minor chotts of smaller sizes, including Chott Ech Chergui, which is the second largest chott in North Africa [65][66][67][68], Chott El Beida (Chott El Beïdha-Hammam Essoukhna), Chott Oum El Raneb [69], Chott El-Gharbi [70], and Chott El Hodna [71].…”

Section: Study Areamentioning

confidence: 99%

A GRASS GIS Scripting Framework for Monitoring Changes in the Ephemeral Salt Lakes of Chotts Melrhir and Merouane, Algeria

Lemenkova

2023

ASI

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Automated classification of satellite images is a challenging task that enables the use of remote sensing data for environmental modeling of Earth’s landscapes. In this document, we implement a GRASS GIS-based framework for discriminating land cover types to identify changes in the endorheic basins of the ephemeral salt lakes Chott Melrhir and Chott Merouane, Algeria; we employ embedded algorithms for image processing. This study presents a dataset of the nine Landsat 8–9 OLI/TIRS satellite images obtained from the USGS for a 9-year period, from 2014 to 2022. The images were analyzed to detect changes in water levels in ephemeral lakes that experience temporal fluctuations; these lakes are dry most of the time and are fed with water during rainy periods. The unsupervised classification of images was performed using GRASS GIS algorithms through several modules: `i.cluster’ was used to generate image classes; `i.maxlik’ was used for classification using the maximal likelihood discriminant analysis, and auxiliary modules, such as `i.group’, `r.support’, `r.import’, etc., were used. This document includes technical descriptions of the scripts used for image processing with detailed comments on the functionalities of the GRASS GIS modules. The results include the identified variations in the ephemeral salt lakes within the Algerian part of the Sahara over a 9-year period (2014–2022), using a time series of Landsat OLI/TIRS multispectral images that were classified using GRASS GIS. The main strengths of the GRASS GIS framework are the high speed, accuracy, and effectiveness of the programming codes for image processing in environmental monitoring. The presented GitHub repository, which contains scripts used for the satellite image analysis, serves as a reference for the interpretation of remote sensing data for the environmental monitoring of arid and semi-arid areas of Africa.

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Retrieval and interpretation of precipitation rates generated from the composition of the Merouane Chott ephemeral lake

Cited by 8 publications

References 7 publications

Geochemistry and Behavior of Trace Elements During the Complete Evaporation of the Merouane Chott Ephemeral Lake: Southeast Algeria

Geochemistry and Behavior of Trace Elements During the Complete Evaporation of the Merouane Chott Ephemeral Lake: Southeast Algeria

Mineral precipitation rates during the complete evaporation of the Merouane Chott ephemeral lake

A GRASS GIS Scripting Framework for Monitoring Changes in the Ephemeral Salt Lakes of Chotts Melrhir and Merouane, Algeria

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