Document ID: EPA-HQ-OPP-2004-0062-0016
Agency: epa
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Title: 
Posted Date: 2007-08-29T04:00Z

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        Mechanistic Ground Spray Drift Model
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<p>T. S. Ramanarayanan<br> on behalf of<br> Spray Drift Task Force </p>
<p><a href="#what">What is available?</a><br>
<a href="#data">SDTF Ground Spray Drift Data</a><br>
<a href="#canada">Drift Data from Agriculture Canada – Dr. Thomas Wolf</a><br>
<a href="#limit">Limitations of AgDRIFT Ground Model</a><br>
<a href="#suggest">Suggestions for Mechanistic model evaluation</a><br>
<a href="#future">Suggestions for future drift model development</a><br>
<a href="#thanks">Thank you for your Attention.</a>
</p>
<hr>

<p><a name="what"></a><strong>What is available?</strong></p>
<p><ul>
<li><p>SDTF data on ground spray drift</p></li>
<li><p>AgDRIFT</p>
	<p><ul>
	<li><p>Ground model built on regression fits</p></li>
	</ul></p>
</li>
<li><p>Agriculture Canada</p>
	<p><ul>
	<li><p>Dr. Thomas Wolf</p></li>
	<li><p>Ground spray</p></li>
	<li><p>Horizontal and vertical deposition</p></li>
	</ul></p>
</li>
</ul></p>
<hr>
<p><a name="data"></a><strong>SDTF Ground Spray Drift Data</strong></p>
<p><ul>
<li><p>Two years (1992 and 1993)</p></li>
<li><p>Four Nozzles</p>
	<p><ul>
	<li><p>TX-6 (VMD = 175 µm; Fine)</p></li>
	<li><p>8004 (VMD = 340 µm; Medium/Coarse)</p></li>
	<li><p>8004LP (VMD = 486 µm; Coarse/Very Coarse)</p></li>
	<li><p>8010LP (VMD = 762 µm; Very Coarse)</p></li>
	</ul></p>
</li>
<li><p>Two boom heights – 20" and 50"</p></li>
<li><p>Total number of treatments - 12</p>
	<p><ul>
	<li><p>Standard – 8004 Nozzle at 20" boom height</p></li>
	<li><p>Variable</p></li>
	</ul></p>
</li>
</ul></p>
<hr>
<p><a name="canada"></a><strong>Drift Data from Agriculture Canada – Dr. Thomas Wolf</strong></p>
<p><ul>
<li><p>High quality data set – evaluated by Stewart Ag</p></li>
<li><p>Available in electronic format</p></li>
<li><p>Atomization studies conducted on nozzles used</p></li>
<li><p>Weather - similar to SDTF studies</p></li>
<li><p>Equipment – similar to SDTF, but expands range</p></li>
<li><p>Extends range of spray quality to include more coarse and very coarse droplet size treatments</p></li>
<li><p>Samples closer to treated area than SDTF studies</p></li>
</ul></p>
<hr>
<p><a name="limit"></a><strong>Limitations of AgDRIFT Ground Model</strong></p>
<p><ul>
<li><p>Empirical, Tier 1 only, (High- Low and Fine-Medium+ only curves)</p></li>
<li><p>Coarse and Very Coarse spray quality cannot be evaluated</p></li>
<li><p>Effect of wind speed and other conditions cannot be evaluated</p></li>
<li><p>Cannot perform probabilistic assessments</p></li>
<li><p>Need for mechanistic ground model</p></li>
</ul></p>
<hr>
<p><a name="suggest"></a><strong>Suggestions for Mechanistic model evaluation</strong></p>
<p><ul>
<li><p>Compare, improve and validate current mechanistic ground spray model by Teske et al., 2004</p>
	<p><ul>
	<li><p>Use SDTF and Ag Canada data</p></li>
	</ul></p>
</li>
<li><p>Conduct sensitivity analysis to determine the characteristics of the model</p></li>
</ul></p>
<hr>
<p><a name="future"></a><strong>Suggestions for future drift model development</strong></p>
<p><ul>
<li><p>Compare ground model to other data sets</p>
	<p><ul>
	<li><p>Ganzelmaier, Rautman; Van de Zande; Smith & Bode; Arvidsson</p></li>
	<li><p>Some of the data available in AgDBASE</p></li>
	</ul></p>
</li>
<li><p>Look for possible refinements from analyses</p></li>
<li><p>Develop multiple application ground model for probabilistic assessments</p></li>
<li><p>Incorporate drift module into EXPRESS</p></li>
</ul></p>
<hr>
<p><a name="thanks"></a><strong>Thank you for your Attention.
</strong></p>
<p>Questions??</p>
<hr>
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