Search publications of the members of the Royal Belgian institute of natural Sciences
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Vertebrate diversity patterns in the Congo Basin rainforests
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Working together to develop biodiversity research and monitoring related capacities in the DR Congo
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Genomic signals of congeneric hybridisation confirmed in the Lake Tanganyikan cichlid genus Ophthalmotilapia
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Behaviour and neural gene expression predict patterns of asymmetric hybridisation in a mouthbrooding cichlid genus (Ophthalmotilapia) from Lake Tanganyika
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The cichlids of the Lake Edward system: diversity and ecology
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Sardine science: genomics and stakeholder involvement for sustainable management of Lake Tanganyika clupeid fisheries
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Monogenean parasites of sardines in Lake Tanganyika: potential tags for host history and population structure
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Classifying colors: resolving the relationships among color variants of the Lake Tanganyika cichlid genus Tropheus
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Newly-discovered population of chimpanzees in the DRC : A case for a new protected area?
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Zoonotic investigations of Zaire Ebolavirus in Likati, Democratic Republic of Congo, 2017
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First record of the North African terrestrial snail Otala xanthodon (Anton, 1838) in Belgium
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Identification of invasive Physa sp. from Inagro aquaculture facility
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Identifying invasive alien species by DNA barcoding using currently available sequence data
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Natural infection of gastropods by feline cardio-pulmonary parasites in various areas of Greece: preliminary results
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Integrative taxonomic re-description of Halisarca magellanica and description of a new species of Halisarca (Porifera, Demospongiae) from Chilean Patagonia
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DNA identification of species of the Anopheles maculipennis complex and first record of An. daciae in Belgium
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Les Insectes du Monde. Biodiversité. Classification. Clés de détermination des familles - Tomes 1-2
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A new species of Sarmydus Pascoe, 1867 (Cerambycidae: Prioninae: Anacolini) from Ncobar Island, India
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Ground Deformations Observed for Three Decades (1992-2022) above Old and Deep Coal Mines Reused for Deep Gas Storage Sites (Wallonia, Belgium) using PS-InSAR Time-series.
- The coal mining exploitations in Wallonia was gradually phased out till the end of the last century. Groundwater pumping was ceased, implying a groundwater rebound at varying rates that can still be observed by radar interferometry. The sustainability of architectural and technical facilities within those zones must be monitored to reduce environmental concerns during the post-mining phase and their reuse as gas storage reservoir locations. PS-InSAR approach has shown land surface deformations during three decades in a large area (96 km²) covering the cities from Binche to Anderlues (Wallonia, Belgium). Two coal mines are concerned: (i) to the West, the Ressaix-Mariemont-La Louvière concession where a small part was used as the Peronnes Gas Storage (PGS) reservoir; (ii) to the East, the Bois de la Haye concession where about half of the area has been used as the Anderlues Gas Storage (AGS) reservoir. To maintain the PGS reservoir dry, a private company has maintained groundwater pumping activities till 1998 with a dewatering rate of 40 m³/h. After 1998, the water levels raised from 8 m/yr at the beginning to 2.5 m/yr around 2010. The gas storage reservoir of Anderlues is known to be relatively dry. Using a multi-sensor radar dataset including radar images acquired by the European Space Agency’s satellites of ERS1/2, ENVISAT ASAR, and Sentinel-1A, 236 interferograms were constructed. Ground displacements are mapped and subdivided into three successive time intervals showing: (1) during ERS1/2 (1991-2000), a gradient from positive annual average velocities (West) to negative ones (East) across the PGS site and mostly negative values (-0.5 to -3.0 mm/yr) above the AGS site; (2) during ENVISAT ASAR (2003-2010), the positive LOS velocities (0.5 to 2.89 mm/yr) are present along an NW-SE ellipsoid across PGS leaving only negative LOS values in the NW corner while negative LOS velocities were also recorded along the Binche city (-0.5 to -2 mm/yr). During the same period, the AGS is facing negative LOS velocity values and extending to the south as well; (3) during Sentinel-1A (2015-2022), almost all the PGS is affected by positive annual LOS velocities (0.5 to about 4-5 mm/yr) even extending towards the north outside the limits of PGS. AGS is still affected by negative LOS values in the middle and SE parts. Ground displacements measured at the surface of old coal mine concessions and recent gas storage sites allow following the impact of the use of the subsurface through time.
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Ground Deformations Related to an Old Drainage Adit in The Abandoned Coal Concession Around Saint-Vaast (Wallonia, Belgium) Analysed Using PS-InSAR and Piezometric Wells Time Series
- The exploitations of the coal mines in Wallonia were ceased progressively till the end of the last century. Groundwater pumping’s were stopped inducing a groundwater rebound with different rates but still visible today with radar interferometry. To mitigate the threats to the environment during the post-mining period, flooding and outbreak risks, surface ground deformations and the stability of civil engineering infrastructures in the vicinity of those mined areas need to be monitored. The persistent scatterer radar interferometry technique (PS-InSAR) has revealed ground displacements during three decades in Saint-Vaast (Wallonia, Belgium). Under this residential area, an old drainage adit at a depth of approximately 30 m allows mine water discharge to the Haine river. A confined aquifer lies in this Wealdian sandy layer characterized by a weak mechanical resistance and frequent loose sandy pockets. The Saint-Vaast area has so far suffered twice from a clogging rupture in the drainage adit. The clog has induced an underground water pressure increase in the confined aquifer. This water outbreak resulted in a stream of mud, sand and water flowing out during a few days in 2009. This event has induced a displacement at the surface with cracks observed in the walls of several houses nearby. 236 interferograms were produced using images acquired by the ESA’s satellites (ERS1/2, ENVISAT and Sentinel-1A). A time serie of surface displacements from 1991 to 2022 is calculated. Land surface displacements trends before and after both events were recognized. During ERS1/2 (1992–2002) an uplift has a rate exceeding 3 mm/year. The saturation of the Wealdian aquifer sands reduces the effective intergranular stress leading to an uplift. Groundwater recharge slowed down after the uplift and turned to almost stability during ERS (2002-2006) and ENVISAT (2003–2010). The sudden water outbreak in 2009 has resulted in a localized land subsidence. Before and after the second outflow associated to a clog rupture in early 2018, a similar pattern of land surface deformations was observed. After 2018 (Sentinel-1A), the average LOS velocity values are -1.8 mm/year where the 2009 event occured. Piezometric wells drilled after the 2009 event are monitoring the groundwater levels in the Wealdian aquifer. Analysis of piezometric data combined with PS-InSAR allowed to compare the water table evolutions in the confined aquifer and the ground deformations observed at the surface.
