Monitoring Tangier (Morocco) coastal waters for As, Fe and P concentrations using ESA Sentinels-2 and 3 data: An exploratory study

Cherif, El Khalil; Salmoun, Farida; Yemlahi, Anass El; Magalhaes, J.M.

doi:10.1016/j.rsma.2019.100882

Cited by 6 publications

(6 citation statements)

References 19 publications

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“…Xu and Mao, based on GF-1, show that the estimation model based on the logarithmic combination of wavebands can be used to retrieve the chlorophyll-a concentration in the clean water of Qiandao Lake [ 18 ]. Landsat-8 and Sentinel-2/3 data have been used for water quality determination owing to their high distribution rate [ 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Feng et al proposed the use of GF-1 WFV and Landsat-8 OLI to retrieve the chlorophyll-a concentration in Taihu Lake, which can improve the retrieval accuracy [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Retrieval and Evaluation of Chlorophyll-a Concentration in Reservoirs with Main Water Supply Function in Beijing, China, Based on Landsat Satellite Images

Lai

Zhang

Song

et al. 2021

IJERPH

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Remote sensing retrieval is an important technology for studying water eutrophication. In this study, Guanting Reservoir with the main water supply function of Beijing was selected as the research object. Based on the measured data in 2016, 2017, and 2019, and Landsat-8 remote sensing images, the concentration and distribution of chlorophyll-a in the Guanting Reservoir were inversed. We analyzed the changes in chlorophyll-a concentration of the reservoir in Beijing and the reasons and effects. Although the concentration of chlorophyll-a in the Guanting Reservoir decreased gradually, it may still increase. The amount and stability of water storage, chlorophyll-a concentration of the supply water, and nitrogen and phosphorus concentration change are important factors affecting the chlorophyll-a concentration of the reservoir. We also found a strong correlation between the pixel values of adjacent reservoirs in the same image, so the chlorophyll-a estimation model can be applied to each other.

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Section: Introductionmentioning

confidence: 99%

Retrieval and Evaluation of Chlorophyll-a Concentration in Reservoirs with Main Water Supply Function in Beijing, China, Based on Landsat Satellite Images

Lai

Zhang

Song

et al. 2021

IJERPH

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“…The area of interest included the Boukhalef river mouth and both nearby beaches, Jbila and Sidikacem, as well as non-polluted waters at Sol, Bakacem, Achekar, and Diplomatic Forest beaches, which are quite distant from the river estuary. It was reported in a previous study carried out in this Tangier coastal area [5] that high spatial resolution images, such as those from ESA Sentinel 2 imaging spectrometer, often revealed patches of increased water reflectance values of the Boukhalef river mouth.…”

Section: Resultsmentioning

confidence: 68%

“…Er-Raioui et al, (2012) [33], reported that more than 232 tons/day (t/d) of suspended solids are discharged in the Tangier and Tetouan coast and that these marine areas are the most affected by human activities in the Moroccan Mediterranean coastline. Previous studies were carried out in the west coast of Tangier [4][5][6][7]34] to assess its bathing water quality, especially considering the industrial growth that Tangier has experienced in the last decades. The reports concluded that the human activities concentrated along the west coast of Tangier have a potential impact on bathing waters, especially at Jbila and Sidikacem beaches.…”

Section: Site Descriptionmentioning

confidence: 99%

“…Coastal water pollution is one of the serious environmental health risks that is affecting most of the world's coastal environments [2,3]. Therefore, monitoring and improving coastal water quality is becoming an inevitable necessity [4][5][6][7][8][9]. Escherichia coli (E. coli) is one of the commonly used bacteria for indicating the fecal contamination in rivers and coastal waters [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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COVID-19 Pandemic Consequences on Coastal Water Quality Using WST Sentinel-3 Data: Case of Tangier, Morocco

Cherif

Vodopivec

Mejjad

et al. 2020

Water

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The west coast of Tangier, in northern Morocco, has been affected by industrial wastewater discharge that reaches the ocean through the Boukhalef river. Therefore, the Jbila and Sidikacem beaches near to the Boukhalef river mouth have been classified as polluted for many years. With the aim of determining the COVID-19 pandemic consequences on the Tangier coastal environment, a linear model using Sentinel 3 water surface temperature (WST) has been tested in several locations. Data from April 2019 and April 2020, before and during the COVID-19 pandemic related emergency status in Morocco, were compared. The results from April 2019 showed high WST values and consequently, the poorest water quality in the sites closest to the Boukhalef river mouth. On the other hand, the results from April 2020 showed normal WST values and high water quality in the same study area. These results illustrate the usefulness of Sentinel 3 WST for the estimation of bathing water quality on the west coast of Tangier. The study shows the positive impact of the COVID-19 pandemic consequences on the coastal environment quality in the study area and indicates the importance of decreasing the industrial discharge on the west coast of Tangier. The same methodology could be used in decision-making processes and to reduce cost, time and human resources for coastal monitoring systems. We demonstrate the potential of using the Sentinel 3 data for coastal waters monitoring, as well as the need for stricter controls of pollutant discharges into the world’s rivers.

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“…In this context, the availability of low cost and quick response tools, such as numerical models and satellite imageries, becomes of great relevance to study coastal waters quality [7][8][9][10]. In particular the use of numerical models allows to predict the fateof polluted substances in the marine environment, giving an added value to the analysis of the transport and decay of the different physiological states of the E. coli population within a bathing area [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Development of a New Predictive index (Bathing Water Quality Index, BWQI) Based on Escherichia coli Physiological States for Bathing Waters Monitoring

Bonamano

Madonia

Caruso

et al. 2021

JMSE

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Bacterial pathogens in coastal aquatic ecosystems pose a potential public health hazard for bathing water use. The European Bathing Water Directive (2006/7/EC) currently relies on the culturability of fecal pollution bacterial indicators such as Escherichia coli, without considering dormant or quiescent (Viable But Not Culturable, VBNC) cells, whose possible resuscitation after bathers ingestion cannot be excluded. Standard methods are also time-consuming and therefore hardly meet early warning needs of marine monitoring. To solve this issue, a new index, the Bathing Water Quality Index (BWQI), has here been developed, allowing to identify the most favorable coastal zones for recreational use. The index was calculated by combining numerical simulations of living and dormant E. coli abundances and their residence times. To specifically set up the model with the different physiological states of the whole E. coli population, an ad hoc experiment based on the fluorescent antibody method was performed. The BWQI application to Santa Marinella bathing area highlights a potential risk for human health in the zone most frequented by bathers. This study provides a predictive tool to support preventive decisions of the competent authorities and to properly protect bathers’ health, stressing the need for improved methods for environmental monitoring.

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Monitoring Tangier (Morocco) coastal waters for As, Fe and P concentrations using ESA Sentinels-2 and 3 data: An exploratory study

Cited by 6 publications

References 19 publications

Retrieval and Evaluation of Chlorophyll-a Concentration in Reservoirs with Main Water Supply Function in Beijing, China, Based on Landsat Satellite Images

Retrieval and Evaluation of Chlorophyll-a Concentration in Reservoirs with Main Water Supply Function in Beijing, China, Based on Landsat Satellite Images

COVID-19 Pandemic Consequences on Coastal Water Quality Using WST Sentinel-3 Data: Case of Tangier, Morocco

Development of a New Predictive index (Bathing Water Quality Index, BWQI) Based on Escherichia coli Physiological States for Bathing Waters Monitoring

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