Multi-approach monitoring of a high-risk sinkhole in the Ebro Valley, Spain using high-precision leveling, terrestrial laser scanner, photogrammetry, and BOTDA distributed optical fiber sensing
Abstract:<p>The analyzed active sinkhole is located on the outer bank of a meander of the Ebro River, affecting the Alcal&#225; de Ebro village and a flood-control embankment dike. Between 1927 and 1957 the Ebro River channel experienced a major shift of 500 m until its present position abutting the village. The development of the sinkhole, around 100 m long, is related to dissolution of cavernous salt-bearing evaporites (i.e., halite and glauberite) underlying the unconsolidated alluvium. It expe… Show more
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