A5046954678- Geophysical and Geoelectrical Methods
- Coastal and Marine Dynamics
- Geology and Paleoclimatology Research
- Geophysical Methods and Applications
- Aeolian processes and effects
- Geological formations and processes
- Underwater Acoustics Research
- Seismic Waves and Analysis
- Methane Hydrates and Related Phenomena
- Geological Modeling and Analysis
- Geochemistry and Geologic Mapping
- Hydrocarbon exploration and reservoir analysis
- Groundwater and Isotope Geochemistry
- Coastal wetland ecosystem dynamics
- Geological and Geophysical Studies
- NMR spectroscopy and applications
- Seismic Imaging and Inversion Techniques
- Tropical and Extratropical Cyclones Research
- Water Quality and Resources Studies
- Landslides and related hazards
- Coastal and Marine Management
- Geological Studies and Exploration
- Marine and environmental studies
- Atmospheric and Environmental Gas Dynamics
- Oceanographic and Atmospheric Processes
Shanghai Jiao Tong University
2022-2024
GEOMAR Helmholtz Centre for Ocean Research Kiel
2017-2023
Texas A&M University
2011-2018
Mitchell Institute
2013-2015
Discovery Place
2011
Abstract First reported in the 1960s, offshore freshened groundwater (OFG) has now been documented most continental margins around world. In this review we compile a database documenting OFG occurrences and analyze it to establish general characteristics controlling factors. We also assess methods used map characterize OFG, identify major knowledge gaps, propose strategies address them. global volume of 1 × 10 6 km 3 ; predominantly occurs within 55 coast down water depth 100 m. is mainly...
Abstract Although offshore freshened groundwater (OFG) systems have been documented in numerous continental margins worldwide, their geometry, controls and emplacement dynamics remain poorly constrained. Here we integrate controlled-source electromagnetic, seismic reflection borehole data with hydrological modelling to quantitatively characterise a previously unknown OFG system near Canterbury, New Zealand. The consists of one main, two smaller, low salinity bodies. main body extends up 60...
Abstract. For millennia, humans have gravitated towards coastlines for their resource potential and as geopolitical centres global trade. A basic requirement ensuring water security coastal communities relies on a delicate balance between the supply demand of potable water. The interaction freshwater saltwater in settings is, therefore, complicated by both natural human-driven environmental changes at land–sea interface. In particular, ongoing sea-level rise, warming deoxygenation might...
Abstract Carbonate lithologies host considerable quantities of the Earth's freshwater resources and partially supply a quarter global population with drinkable water. In addition, carbonates constitute substantial amounts coastlines, yet it is not known if how they can sustain freshened groundwater offshore. Here, we use controlled‐source electromagnetic, seismic reflection, core sample data to derive lithological model for eastern margin Maltese Islands identify four distinct resistivity...
The MARCAN project, launched last January, is working to fill a gap in our knowledge of how freshwater flowing underground shapes and alters the continental margins.
Abstract. Gully formation has been associated to groundwater seepage in unconsolidated sand- gravel-sized sediments. Our understanding of gully evolution by mostly relies on experiments and numerical simulations, these rarely take into consideration contrasts lithology permeability. In addition, process-based observations detailed instrumental analyses are rare. As a result, we have poor the temporal scale influence geological heterogeneity their formation. This is particularly case for...
Weymer, B.A.; Houser, C., and Giardino, J.R., 2015. Poststorm evolution of beach-dune morphology: Padre Island National Seashore, Texas.The response recovery barrier islands to extreme storms ultimately relative sea-level rise depends on the height extent foredunes storm surge. The impact is complicated by tendency dune morphology vary alongshore at a range spatial scales, it reasonable assume that this variable will be preserved within subsurface stratigraphy. We used ground-penetrating...
Groundwater resources in coastal regions are facing enormous pressure caused by population growth and climate change. Few studies have investigated whether offshore freshened groundwater systems connected with terrestrial aquifers recharged meteoric water, or paleo-groundwater that no longer associated aquifers. Distinguishing between the two has important implications for potential extraction to alleviate water stress many communities, yet very little is known about these connections,...
Electromagnetic (EM) geophysical methods are well equipped to distinguish electrical resistivity contrasts between freshwater-saturated and seawater-saturated formations. Beneath the semi-arid, rapidly urbanizing island of Malta, offshore groundwater is an important potential resource but it not known whether regional mean sea-level aquifer (MSLA) extends offshore. To address this uncertainty, land-based alongshore across-shore time-domain electromagnetic (TDEM) responses were acquired with...
Abstract We have better maps of the surfaces Venus, Mars, and Moon than Earth’s seafloor. There is even less information available about geologic structure below In particular, transition zone deep beneath crossing coastline a very poorly studied frontier resulting from limitations technology logistical barriers. Here, we point out significance this region for understanding fundamental processes, geohazards, especially coastal aquifers. One prominent example increasing awareness importance...
Abstract The study of offshore freshened groundwater (OFG) is gaining importance due to population growth and environmental pressure on coastal water resources. Marine controlled source electromagnetic (CSEM) methods can effectively map the spatial extent OFG systems using electrical resistivity as a proxy. Integrating these models with sub‐surface properties, such host‐rock porosity, allows for estimates pore‐water salinity. However, evaluating uncertainty in salinity obtained from...
Abstract. Shorelines exhibit long-range dependence (LRD) and have been shown in some environments to be described the wave number domain by a power-law characteristic of scale independence. Recent evidence suggests that geomorphology barrier islands can, however, as result systematic variations underlying framework geology. The LRD geology, which influences island its response storms sea level rise, has not previously examined. Electromagnetic induction (EMI) surveys conducted along Padre...
Electromagnetic induction (EMI) techniques are becoming increasingly popular for near-surface coastal geophysical applications. However, few studies have explored the capabilities and limitations of portable multifrequency EMI profilers mapping large-scale ([Formula: see text]) barrier island hydrogeology. The purpose this study is to investigate influence groundwater dynamics on apparent conductivity [Formula: text] separate effects hydrology geology from signal. Shore-normal alongshore...
Abstract. Barrier island transgression is influenced by the alongshore variation in beach and dune morphology, which determines amount of sediment moved landward through wash-over. While several studies have demonstrated how variations morphology affect response to storms, reasons for that implications management remain unclear. This paper builds on previous research demonstrating paleo-channels irregular framework geology can a directional influence morphology. The relict Padre Island...
Summary The time-domain controlled source electromagnetic (TD-CSEM) method is commonly used to map shallow regions of the seafloor from several metres up a couple hundred penetration depth. effective in detecting conductivity anomalies within seafloor. Compared applied frequency-domain method, application particularly marine environments, where signal less susceptible masking issue well-known airwave effect. However, current interpretation TD-CSEM data mainly based on one-dimensional...