Book Description
Keywords: groundwater modeling, subsurface flows, soil stratigraphy, wetland restoration.
Author : Swamy Pati
Publisher :
Page : 137 pages
File Size : 13,84 MB
Release : 2006
Category :
ISBN :
Keywords: groundwater modeling, subsurface flows, soil stratigraphy, wetland restoration.
Author :
Publisher :
Page : pages
File Size : 38,73 MB
Release : 2004
Category :
ISBN :
The North Carolina Department of Transportation purchased a 270-hectare, roughly elliptical tract of agricultural land, known as Juniper Bay (a Carolina Bay), to convert to wetlands as part of their wetlands mitigation program. Preliminary water balance work suggested that there are significant flows of groundwater entering and leaving the tract. This study was initiated to examine the subsurface potentials and determine the degree to which a ditch around the perimeter of the tract controls the lateral fluxes of groundwater in the surficial aquifer. Five nests of piezometers were installed along each of four 150-m transects crossing the perimeter ditch at approximately the major and minor axes of the tract, which correspond to the suspected maxima of influx and efflux. Deep soil cores (up to 13 m) were collected along each transect to guide placement of piezometers for monitoring hydraulic heads. Piezometer water levels were recorded at 15-minute intervals. Meteorological data were collected with an on-site weather station. Models were developed for the four transects using Visual MODFLOW. Models were calibrated with observed groundwater pressure heads. Maximum absolute error in the calibration process was 0.5 m. The modeling results suggested that the ditch drained water from the surficial system from both sides. In the deeper sand layers, there was an indication of groundwater flowing into the bay at NW and NE transects. Groundwater flows in the SW transect indicated outflows. The SE transects showed water draining into the ditch from both sides. The models were extended to 800-m inside the bay to simulate conditions after the interior ditch system was blocked. Simulation results showed groundwater inflows through the NW, NE, and SE transect, and groundwater outflows through SW transect. The lateral influence of the perimeter ditch had a maximum of approximately of 100 m, observed at the SW transect, and a minimum of 30 m, observed at the SE transect. The extent o.
Author :
Publisher :
Page : 854 pages
File Size : 45,15 MB
Release : 2007
Category : Dissertations, Academic
ISBN :
Author : National Research Council
Publisher : National Academies Press
Page : 449 pages
File Size : 29,81 MB
Release : 2002-10-10
Category : Science
ISBN : 0309082951
The Clean Water Act (CWA) requires that wetlands be protected from degradation because of their important ecological functions including maintenance of high water quality and provision of fish and wildlife habitat. However, this protection generally does not encompass riparian areasâ€"the lands bordering rivers and lakesâ€"even though they often provide the same functions as wetlands. Growing recognition of the similarities in wetland and riparian area functioning and the differences in their legal protection led the NRC in 1999 to undertake a study of riparian areas, which has culminated in Riparian Areas: Functioning and Strategies for Management. The report is intended to heighten awareness of riparian areas commensurate with their ecological and societal values. The primary conclusion is that, because riparian areas perform a disproportionate number of biological and physical functions on a unit area basis, restoration of riparian functions along America's waterbodies should be a national goal.
Author : Rezneat M. Darnell
Publisher :
Page : 444 pages
File Size : 42,24 MB
Release : 1976
Category : Construction industry
ISBN :
Author :
Publisher : National Technical Info Svc
Page : 648 pages
File Size : 46,70 MB
Release : 1998
Category : Technology & Engineering
ISBN :
This document is a cooperative effort among fifteen Federal agencies and partners to produce a common reference on stream corridor restoration. It responds to a growing national and international interest in restoring stream corridors.
Author :
Publisher :
Page : 258 pages
File Size : 26,70 MB
Release : 2000
Category : Eutrophication
ISBN :
Author : Harold Mooney
Publisher : Univ of California Press
Page : 1008 pages
File Size : 46,2 MB
Release : 2016-01-19
Category : Nature
ISBN : 0520278801
This long-anticipated reference and sourcebook for CaliforniaÕs remarkable ecological abundance provides an integrated assessment of each major ecosystem typeÑits distribution, structure, function, and management. A comprehensive synthesis of our knowledge about this biologically diverse state, Ecosystems of California covers the state from oceans to mountaintops using multiple lenses: past and present, flora and fauna, aquatic and terrestrial, natural and managed. Each chapter evaluates natural processes for a specific ecosystem, describes drivers of change, and discusses how that ecosystem may be altered in the future. This book also explores the drivers of CaliforniaÕs ecological patterns and the history of the stateÕs various ecosystems, outlining how the challenges of climate change and invasive species and opportunities for regulation and stewardship could potentially affect the stateÕs ecosystems. The text explicitly incorporates both human impacts and conservation and restoration efforts and shows how ecosystems support human well-being. Edited by two esteemed ecosystem ecologists and with overviews by leading experts on each ecosystem, this definitive work will be indispensable for natural resource management and conservation professionals as well as for undergraduate or graduate students of CaliforniaÕs environment and curious naturalists.
Author : Aat Barendregt
Publisher :
Page : 320 pages
File Size : 50,33 MB
Release : 2009
Category : Estuarine ecology
ISBN : 9783823615514
Author :
Publisher :
Page : 620 pages
File Size : 31,70 MB
Release : 2003
Category : Government publications
ISBN :