000005760 001__ 5760
000005760 005__ 20220406171011.0
000005760 037__ $$aCTALK-2022-0056
000005760 100__ $$aVan Camp, M.
000005760 245__ $$aExtreme hydrometeorological events, a challenge for geodesy and seismology networks
000005760 260__ $$c2022
000005760 269__ $$c2022-05-23
000005760 520__ $$aThe use of seismometer and gravimeter captures complementary data and brings a new understanding of the July 2021 catastrophic floods in Belgium. A sudden increase in seismic noise coincides with the testimony reporting on a “tsunami” downstream of the Membach geophysical station, along the Vesdre valley. Concurrently, the gravimeter evidenced a rising saturation of the weathered zone, thus showing less and less water accumulation. When rain re-intensified after a 3-hour break, the saturated state of the subsoil induced an accelerated increase of the runoff, as revealed by the Vesdre River flow, in a much stronger way than during the rainy episodes just before. We show that a gravimeter can detect in real-time the saturation of the catchment subsoil and soil. This saturation resulted, when the rain re-intensified, in a sudden, devastating and deadly flood. This opens perspectives to use real-time gravity for early warnings of such events
000005760 594__ $$aNO
000005760 6531_ $$aMembach
000005760 6531_ $$aSuperconducting gravimeter
000005760 6531_ $$aFlash Flood July 2021
000005760 6531_ $$aVesdre Valley
000005760 6531_ $$aSeismic network
000005760 6531_ $$aHydrogeology
000005760 700__ $$ade Viron, O.
000005760 700__ $$aDassargues, A.
000005760 700__ $$aDelobbe, L.
000005760 700__ $$aChanard, K.
000005760 700__ $$aGobron, K.
000005760 773__ $$tEGU General Assembly
000005760 8560_ $$fmichel.vancamp@observatoire.be
000005760 906__ $$aContributed
000005760 980__ $$aCTALKCONT