USGS - science for a changing world

USGS Professional Pages

Blank space
Search USGS Professionals Featured Profiles Blank space Frequently Asked Questions  |  About The USGS Professional Pages

Hedeff Essaid

Research Hydrologist

Contact Info


Short Biography

My research has focused on subsurface flow and contaminant transport problems that require integration of field information with quantitative analyses to gain a conceptual understanding of system behavior. This work has involved the development and use of models to understand and quantify the 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; and the hydrology of natural and incised mountain meadows.



Read Full Professional Summary

Publications

Rowe, Gary L., Jr.; Belitz, Kenneth; Essaid, Hedeff I.; Gilliom, Robert J.; Hamilton, Pixie A.; Hoos, Anne B.; Lynch, Dennis D.; Munn, Mark D.; Wolock, David W., 2010. Design of Cycle 3 of the National Water-Quality Assessment Program, 2013-2022: Part 1: Framework of Water-Quality Issues and Potential Approaches . U.S. Geological Survey Open-File Report 2009-1296, v, 54 p. [Link]

Eddy-Miller, Cheryl A.; Wheeler, Jerrod D.; Essaid, Hedeff I., 2009. Characterization of Interactions between Surface Water and Near-Stream Groundwater along Fish Creek, Teton County, Wyoming, by Using Heat as a Tracer. U.S. Geological Survey Scientific Investigations Report 2009-5160, vi, 54 p. [Link]

Delin, G. N.; Essaid, H. I.; Cozzarelli, I. M.; Lahvis, M. H.; Bekins, B. A. , 1998. Ground Water Contamination by Crude Oil near Bemidji, Minnesota. U.S. Geological Survey Fact Sheet 084-98, 4 p.

Essaid, Hedeff I.; Bekins, Barbara A., 1998. Modeling solute-transport and biodegradation with BIOMOC. U.S. Dept. of the Interior, U.S. Geological Survey ; Branch of Information Services [distributor], Fact Sheet 095-98, 1 folded sheet ([4]) : ill. ; 28 cm. ill. [Link]

Essaid, Hedeff I.; Bekins, Barbara A., 1997. BIOMOC, a multispecies solute-transport model with biodegradation. U.S. Dept. of the Interior, U.S. Geological Survey ; Information Services [distributor], Water-Resources Investigations Report 97-4022, viii, 68 p. :ill. ;28 cm.

Essaid, H. I., 1992. Simulation of freshwater and saltwater flow in the coastal aquifer system of the Purisima Formation in the Soquel-Aptos Basin, Santa Cruz County, California. U.S. Geological Survey ; Books and Open-File Reports Section [distributor], Water-Resources Investigations Report 91-4148, v, 35 p. :ill. ;28 cm.

Essaid, H. I., 1990. The computer model SHARP, a quasi-three-dimensional finite-difference model to simulate freshwater and saltwater flow in layered coastal aquifer systems. U.S. Geological Survey ; Books and Open-File Reports Section [distributor], Water-Resources Investigations Report 90-4130, xi, 181 p. :ill. ;28 cm.

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1






                           

My Science Topics


Science Topic
Subtopic
Hydrologic Processesground-water flow
Hydrologic Processesground-water level
Hydrologic Processeshydrodynamics
Hydrologic Processeshydrology
Hydrologic Processespercolation
Hydrologic Processesrunoff
Hydrologic Processessaltwater intrusion
Hydrologic Processesstreamflow
Hydrologic Processeswater cycle
Environmental Issuescontamination and pollution
Environmental Issuesground-water quality
Environmental Issuesnonpoint-source pollution
Environmental Issueswater quality
Ecology and Environmentwetlands



My USGS Science Strategy Areas

A Water Census of the United States

Climate Variability & Change

Understanding Ecosystems & Predicting Ecosystems Change

Hydrology of Natural and Incised Mountain Meadows

 Development and land use practices have caused channel incision and streambed lowering in many mountain meadows. This has resulted in lowering of groundwater tables and changes in the magnitude and timing of watershed and meadow fluxes. The surface water and groundwater hydrology of mountain meadows under natural and incised conditions has been investigated using numerical simulation. The model results illustrate the interdependence between bedrock and meadow hydrology, and between surface and groundwater flow through the meadow. Meadows are not isolated hydrologic systems and should be studied within the context of the encompassing watershed to fully understand their surface water and groundwater hydrodynamics.

 

Contact Information

Hedeff Essaid
Bldg 15, McKelvey Building, 345 Middlefield Road
Menlo Park, CA 94025-3561
hiessaid@usgs.gov
650-329-4581
650-329-4327 - Fax
Back to top

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://profile.usgs.gov/professional/mypage.php
Page Contact Information:Ask USGS
Page Last Modified: January 24 2013 17:21:51.
Version: 2.6