Accession Number : AD0707823

Title :   RAINFALL, SOIL MOISTURE AND TRAFFICABILITY IN THE VICINITY OF SAIGON.

Descriptive Note : Air Force surveys in geophysics,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Lund,Iver A. ; Meyer,Marvin P.

Report Date : MAY 1970

Pagination or Media Count : 20

Abstract : Trafficability, the ability of a soil to permit the movement of vehicles, is a function of soil strength. Soil strength is related to soil moisture, which in turn is related to many other variables such as soil type, drainage and vegetation. For the preparation of an accurate estimate of the effect of climatology on soil strength conditions, a long-time record of soil moisture measurements is required. For most places in the world no such record exists. In this study, equations developed for estimating soil moisture in sandy silt of the type found in low terraces in the Saigon area are used, in conjunction with a 22-year record of daily rainfall observations, to generate a soil moisture record. From knowledge of soil moisture-strength relations, a soil strength record is generated. This record is used to estimate, for each day of the year, the probability that a given type of vehicle will be able to execute severe maneuvers over the soil without becoming immobilized. (Author)

Descriptors :   (*SOILS, TRAFFICABILITY), (*MOISTURE, MEASUREMENT), RAINFALL, FLEXURAL STRENGTH, DRAINAGE, CLASSIFICATION, SILT, SAND, COMPRESSIVE PROPERTIES, PLANTS(BOTANY), MOBILITY, PROBABILITY, MILITARY REQUIREMENTS, VEHICLES, AIR FORCE OPERATIONS, VIETNAM

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE