Item talk:Q45979

usgs_staff_profile:

 meta:
   status_code: 200
   timestamp: '2023-09-30T15:18:59.983158'
   url: https://www.usgs.gov/staff-profiles/hedeff-i-essaid
 profile:
   abstracts: []
   affiliations: []
   education: []
   email: hiessaid@usgs.gov
   expertise_terms:
   - groundwater flow
   - groundwater level
   - hydrodynamics
   - hydrology
   - percolation
   - runoff
   - saltwater intrusion
   - streamflow
   - water cycle
   - contamination and pollution
   - groundwater quality
   - nonpoint-source pollution
   - water quality
   - wetland ecosystems
   honors: []
   intro_statements:
   - Hedeff Essaid is a Research Hydrologist with the USGS Water Resources Mission
     Area.
   name: Hedeff I Essaid, Ph.D.
   name_qualifier: null
   orcid: 0000-0003-0154-8628
   organization_link: https://www.usgs.gov/mission-areas/water-resources
   organization_name: Water Resources Mission Area
   personal_statement: 'My research has involved the analysis of field data and simulation
     of groundwater systems and watersheds to characterize water and chemical mass
     balances and to study the relative importance of different hydrologic processes
     and flow pathways.  The results of these studies provide an opportunity to compare
     and contrast groundwater transport, surface water-groundwater interactions and
     chemical fate in different hydrologic/environmental settings. This work has
     improved our understanding and quantification of processes and factors that
     control the magnitude and timing of environmental responses to contaminant loading
     and changing hydrology. I have used this approach to study: saltwater intrusion
     in layered coastal aquifer systems; the impact of heterogeneity and hysteresis
     on the distribution of crude oil at a spill site; the role of dissolution and
     biodegradation on the fate of hydrocarbon components in the subsurface; the
     impact of surface water-ground water interactions on stream flow, temperature,
     and water quality; the hydrology of natural and incised mountain meadows; and
     nutrient fate in diverse watersheds.EDUCATION:Stanford University, Ph.D., 1987,
     HydrogeologyStanford University, M.S., 1984, HydrogeologyUniversity of Baghdad,
     Iraq, B.S., 1978, Geology-Geophysics'
   professional_experience: []
   title: Research Hydrologist