Comparing Freshwater and Saltwater Flow in an 85m Deep Sinkhole in Northeast Yucatán, Mexico

Student: Yajaira Ortega-Vidrio

Faculty Mentor: N/A

Geology

College of Science, Technology, and Business

The Yucatán Peninsula’s (YP) geology is dominated by a complex karstic environment. The YP is a groundwater-dependent ecosystem; thus, knowledge of the flow direction of groundwater can help with understanding water supply, human impact, and the ecosystem. The goal of this research project was to use an Acoustic Doppler Current Profiler (ADCP) to determine groundwater flow directions and speed in an 85 m deep sinkhole between the freshwater zone and saltwater. A secondary goal was to determine the freshwater groundwater flow direction in the Holbox fracture zone, which will add to previous analysis to improve an overall understanding of groundwater flow in the area around the tourist area of Riviera Maya. The ADCP was deployed above and below the halocline every 2 m. A multiparameter water quality probe was used to determine the depth of the halocline. The results from the previous year indicated that groundwater flow was predominantly (NAME DIRECTION) closer to the coast. The Yucatán's groundwater resource faces threats from over-extraction, contamination from agricultural runoff, and pollution from urban development. Understanding the dynamics of groundwater flow is vital for developing effective management strategies to protect this fragile resource.