49 research outputs found
Geophysical and Geochemical Approach for Seawater Intrusion Assessment in the Godavari Delta Basin, A.P., India
Search for gravitational waves associated with gamma-ray bursts detected by Fermi and Swift during the LIGO–Virgo run O3b
We search for gravitational-wave signals associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the second half of the third observing run of Advanced LIGO and Advanced Virgo (2019 November 1 15:00 UTC–2020 March 27 17:00 UTC). We conduct two independent searches: a generic gravitational-wave transients search to analyze 86 GRBs and an analysis to target binary mergers with at least one neutron star as short GRB progenitors for 17 events. We find no significant evidence for gravitational-wave signals associated with any of these GRBs. A weighted binomial test of the combined results finds no evidence for subthreshold gravitational-wave signals associated with this GRB ensemble either. We use several source types and signal morphologies during the searches, resulting in lower bounds on the estimated distance to each GRB. Finally, we constrain the population of low-luminosity short GRBs using results from the first to the third observing runs of Advanced LIGO and Advanced Virgo. The resulting population is in accordance with the local binary neutron star merger rate
Climate change impacts on groundwater recharge- uncertainty, shortcomings, and the way forward?
An integrated approach to assessing the regional impacts of climate and socio-
economic change on groundwater recharge is described from East Anglia, UK. Many
factors affect future groundwater recharge including changed precipitation and
temperature regimes, coastal flooding, urbanization, woodland establishment, and
changes in cropping and rotations. Important sources of uncertainty and
shortcomings in recharge estimation are discussed in the light of the results.
The uncertainty in, and importance of, socio-economic scenarios in exploring the
consequences of unknown future changes are highlighted. Changes to soil
properties are occurring over a range of time scales, such that the soils of the
future may not have the same infiltration properties as existing soils. The
potential implications involved in assuming unchanging soil properties are
described. To focus on the direct impacts of climate change is to neglect the
potentially important role of policy, societal values and economic processes in
shaping the landscape above aquifers. If the likely consequences of future
changes of groundwater recharge, resulting from both climate and socio-economic
change, are to be assessed, hydrogeologists must increasingly work with
researchers from other disciplines, such as socio-economists, agricultural
modellers and soil scientists