Accession Number : ADA293337

Title :   Tracked Vehicle Traffic Effects on the Hydrologic Characteristics of Central Texas Rangeland.

Descriptive Note : Final rept.,

Corporate Author : CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL

Personal Author(s) : Thurow, Thomas L. ; Warren, Steven D. ; Carlson, Deirdre H.

PDF Url : ADA293337

Report Date : FEB 1995

Pagination or Media Count : 12

Abstract : The initial change and the temporal recovery pattern of hydrologic, soil, and vegetation characteristics following tracked vehicle passage were documented. Treatments included wet and dry soil moisture conditions at the time of vehicle passage and tracking intensities of 0, 1, 4, and 10 passes by a Bradley Infantry Fighting Vehicle. The study was conducted at Fort Hood, Texas. Tracking on dry soil did not create significantly different infiltration rates or interrill erosion compared to untracked conditions. In contrast, tracking on wet soil created significantly lower infiltration and significantly greater interrill erosion rates, with the initial response and recovery period being greater as the number of vehicle passes increased. Bulk density in the top 50 mm was strongly correlated with infiltration rate immediately following the vehicle traffic. This correlation decreased with the recovery time and the strongest predictive factor became the percent exposed soil. This change can be attributed to the natural amelioration of soil structure and the replacement of bunchgrasses by annual grasses and forbs that provided less cover. After 2 years the soil structure, vegetation cover, and standing crop had recovered to the point that no significant difference existed between treatments in terms of infiltration rate or interrill erosion.

Descriptors :   *HYDROLOGY, *MILITARY TRAINING, *TRACKED VEHICLES, DENSITY, RECOVERY, EXPOSURE(GENERAL), TRAFFIC, INFANTRY, RATES, TRACKING, TIME, EROSION, SOILS, COMBAT VEHICLES, VEHICLES, VEGETATION, MOISTURE, DRY MATERIALS, TEXAS, GRASSES, FARM CROPS.

Subject Categories : Surface Transportation and Equipment
      Combat Vehicles

Distribution Statement : APPROVED FOR PUBLIC RELEASE