Evaluation of the FSCBG aerial spray model's near-wake sensitivity to selected input parameters

106 Pages·1996·6.3 MB·English

by  Teske, Milton E

Historic, Archive Document
Do not assume content reflects current
scientific knowledge, policies, or practices.

2VALUATION OF THE FSCBG
| Seine AERIAL SPRAY MODEL’S
Sieh NEAR-WAKE SENSITIVITY TO
pect SELECTED INPUT PARAMETERS
Forest Health
Technology
Enterprise Team-
Davis
2121C Second Street _
Davis, CA 95616
(VMD1oei1adlmmi)ue amtnee r
0 50 100 150° = 200
Swath Width (m) es
___ FHTET 96-30
on November 1996
Rea,
United States
Department of
Agriculture
NATIONAL
AGRICULTURAL
LIBRARY
Advancing Access to
Global Information for
Agriculture
beneficial insects. fish, and wildlife. Do not apply pesticides W
danger of drift when honey bees or other pollinating insects are visiting Biante:
or in ways that may contaminate water or leave illegal residues.
Avoid prolonged inhalation of pesticide sprays or dusts; wear protective
clothing and equipment, if specified on the label.
If your hands become contaminated with a pesticide, do not eat or drink
until you have washed. In case a pesticide is swallowed or gets in the eyes.
follow the first aid treatment given on the label, and get prompt medical
attention. If a pesticide is spilled on your skin or clothing. remove clothing
immediateiy and wash skin thoroughly.
NOTE: Some States have restrictions on the use of xe
certain pesticides. Check your State and local regula- — ata
tions. Also, because registrations of pesticides are under = i
constant review by the U.S Environmental Protection : IRR?
Agency, consult your local forest pathologist. county :
agriculture agent, or State extension specialist to be sure
the intended use is still registered.
FHTET 96-30
(C.D.1. Technical Note 95-21)
November 1996
EVALUATION OF THE FSCBG
AERIAL SPRAY MODEL’S
NEAR-WAKE SENSITIVITY TO
SELECTED INPUT PARAMETERS
|t eLS FR
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j Al renee
Prepared by: ? REED
i u 2 ; MOPS as
Mil: ton E. Teske LCA aVsS a r ¢Ov 2a— 4;— YOP REp |/ j
—
Continuum Dynamics, Inc.
P.O. Box 3073
Princeton, NJ 08543
Contract No. 53-0343-4-00009
Prepared for:
USDA Forest Service
Forest Health Technology
Enterprise Team (Davis)
2121-C Second Street
Davis, CA 95616
(916) 757-8341 voice
(916) 757-8383 fax
John W. Barry
Program Manager
John W. Barry
Program Manager

Overview
The near-wake portion of the USDA Forest Service aerial application prediction
model FSCBG (Forest Service Cramer-Barry-Grim) is applied to an extensive sensitivity
Study of the most important variables affecting the aerial application of herbicides and
pesticides in the United States and New Zealand. Building on previous work, this study
specifically examines the prediction by the Lagrangian trajectory model of swath width, and
the recovery of buffer distance off-target and downwind from a spray block. Thirteen
separate variable effects (aircraft type, boom width, release height, spraying speed, aircraft
weight, wind direction, wind speed, nonvolatile fraction, temperature and relative humidity
combination, nozzle type, specific gravity, release height and wind speed combination, and
release height, temperature and relative humidity combination) are examined, leading to a
total of 3100 computer runs. Findings from the study include, as before, the importance of
release height and wind speed, but now also include details on the effects of aircraft type
and drop size distribution. Results are presented in graphical form, for ease of
interpretation, and will constitute the Training Module in SpraySafe Manager and the Near-
Wake Sensitivity Library in FSCBG version 5.0, for ready access by the model user.
This work forms a part of the close cooperation between the USDA Forest Service
and New Zealand Forest Research Institute during November 1995, to initiate development
of a stand-alone, highly user-friendly decision support system (called SpraySafe Manager)
that will take advantage of the accurate predictions from FSCBG, but with a simple, easy-
to-use and easy-to-understand user interface.
The author wishes to acknowledge the Support of the USDA Forest Service
(through John Barry) and the New Zealand Forest Research Institute (through John
Tustin), and the advice and program focus provided by Brian Richardson.
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Table of Contents
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