Accession Number : AD0465294


Title :   BLAST EFFECTS ON TREE STAND


Corporate Author : DEPARTMENT OF AGRICULTURE WASHINGTON DC


Personal Author(s) : Fons, W L ; Storey, Theodore G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/465294.pdf


Report Date : Mar 1965


Pagination or Media Count : 48


Abstract : The tree stands on three separate islands varied from 29 to 170 acres in area with vegetation composed of broadleaf trees up to 80 ft tall and coconut palms about 40 ft tall. Several palms on the three islands were equipped with snubber wire arrangement for measuring maximum deflection. The large stand was instrumented with 16 selfrecording ground-level static overpressure gages at eight locations and two self-recording dynamic pressure gages at two locations; the two smaller stands were instrumented with two static overpressure gages each. Sample plots were established on two islands for assessing stem and limb breakage in more detail. Ground-level pressure measurements lengthwise of a large stand showed no attenuation in peak static overpressure. It was not possible to evaluate the degree of peak dynamic pressure attenuation because gages both in front of and inside the tree stand measured unrealistically high peak dynamic pressure compared to values calculated from corresponding peak static overpressure measurements. Nonuniform character of stands prohibited evaluation of shock attenuation from observations of tree damage with distance. The damage to the broadleaf trees was principally crown damage with occasional stem breakage or uprooting. The type of damage experienced was similar for moderate and high yield weapons. Observed damage from two weapons of different yields compare favorably with isodamage curves prepared for broadleaf stands.


Descriptors :   *NUCLEAR EXPLOSIONS , *TREES , BLAST , DAMAGE , DEFLECTION , EXPLOSION EFFECTS , FRACTURE(MECHANICS) , MICRONESIA , PACIFIC OCEAN ISLANDS , RANGE(DISTANCE) , SHOCK WAVES


Subject Categories : Nuclear Explosions and Devices(non-military)


Distribution Statement : APPROVED FOR PUBLIC RELEASE