Abonnement à la biblothèque: Guest
Page d'accueil ICHMT DL Année en cours Archives Comité de direction Centre international pour le transfert de chaleur et de masse

Assessing Soil CO2 at Project Sites in the Desert Southwest, United States

DOI: 10.1615/ICHMT.2012.SEBUA-12.240
pages 323-328

Jon W. Wilson
University of Nevada Las Vegas Department of Civil and Environmental Engineering

Moses Karakouzian
University of Nevada Las Vegas Department of Civil and Environmental Engineering

Résumé

Substantial amounts of air pollution are generated during construction activities. Large volumes of particulate matter and greenhouse gases (GHG's) such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) from fuel combustion and land disturbance are generated. Emissions from construction can represent a large air quality impact that, although temporary in nature, can contribute to the overall release of GHG's in a region. Of the common construction activities, earthmoving that consist of clearing, grading, trenching, soil compaction and cut and fill operation can produce significant amounts of CO2 by disrupting soil aggregates, increasing aeration, incorporating plant residue, and oxidizing soil organic carbon. The amount of CO2 that is sequestered in the soils of a project site varies depending upon the climate of the region, and available vegetation. A preliminary assessment of the project site, prior to construction, to quantify the amount of CO2 stored in the soils will provide a baseline physical condition. Identifying this preliminary condition will provide necessary data to discussions of the projects impact to the environment and the current regulatory criteria that may be relevant.
In the desert southwest of the United States, construction activities generally disturb large segments of sparsely vegetated land. The arid to semi-arid terrain is vegetated by drought resistant species that play a fundamental role in the process of soil formation. Construction activities that disturb these soils reduce the ability of CO2 uptake. This study examines and assesses the amount of stored CO2 in the soils of a project site. A conceptual model of soil disturbance and CO2 release is discussed with emphasis placed on measurement methodologies, soil respiration in desert climates, and cost to construction when considering proposed regulatory regimes.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH