Because larger droplets comprise the largest mass fraction of the released material, and these droplets fall rapidly, the near-application deposition rates are normally dominated by the larger droplets. The linkage of the models requires that appropriate information on the droplet size of the material available to be carried downwind be obtained from AGDISP.
As illustrated in Figure 3.
The scales dictate different requirements for their input parameters. A grid of points in the vicinity of the spray block is needed to define 3. Otherwise, plots based on a regional Cartesian receptor grid will have near-source patterns defined by the sparse set of computation points rather than the shape and configuration of the spray block. Advanced users, conducting special studies, may want to use the option of modifying the populated inputs, or even by-passing the direct AGDISP file read option.
In the AGDISP main screen analysis, the application direction across the spray block, the effective spray width, and the number of swaths are key input parameters in defining a specific application. An application direction is selected 3. The number of swaths required for a specific application is computed by dividing the length of the spray block area at right angles to the application direction by the effective swath width. The current version of AGDISP is an infinite line source model along the direction the aircraft travels, and thus does not require the length of the block i.
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The AGDISP main screen analysis is based on a 2-dimensional height and distance model that defines properties along a centerline across, and downwind, of the application block. An AGDISP toolbox feature extends the 2-dimensional application to provide 3-dimensional representations of spray applications over specified areas. The number of spray swaths is defined by the number of flight lines required to cover the width, x.
The length of the flight lines, y, defines the initial lateral dimension of the plume from the spray block. If the application area is too large for a single application, or the slopes of the underlying terrain dictate, multiple source inputs from AGDISP will be required. Other parameters considered as potentially important in the linkage are given in italics. The values imported from AGDISP for the mean droplet size and active mass aloft must be defined at the same distance downwind of the spray block.
Table 3. The table shows how the size and drift parameters vary across the selected distances. Input Summary 2. The fraction remaining airborne at that distance is used to define the mass of airborne material at that distance. Selecting an appropriate distance for these two parameters involves several considerations. The AGDISP constraint is that the distance should be great enough that effects of the application equipment and evaporation are no longer important processes. This distance downwind needs to be selected where the mean droplet size is no longer decreasing rapidly with distance.
Based on these considerations, a flux plane distance of m is recommended for most applications.
Combining Equations 3. Both systems assume a computational spray block area that may require an approximate fit of the actual area.
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The length dimension of the area also the length of application swaths is not as critical in the linkage. However, because the data transferred from AGDISP applies to a specific block width, the data should be applied only to blocks with equivalent widths. Wind direction in AGDISP is defined in a relative fashion as either being parallel, perpendicular, or somewhere between the sides of the application area.
The application area, as a quadrilateral, is defined by the user selection of four points representing the spray block on a map. Otherwise, the deposition plots will be plotted as occurring in different directions. The wind direction should be defined such that winds will travel over the spray block in the same way as in the AGDISP runs. This plotting procedure matches the assumptions for the source data imported from AGDISP and allows deposition pattern comparisons with plots on the same map.
Otherwise, the different definition wind directions in the AGDISP inputs can result in the deposition patterns occurring in different directions. These are provided as typical values which may be changed as needed. The "Effective rise velocity" should be given a nominally small value of 1. The "Effective radius" is a dispersion model setup parameter that will normally have a value of 1.
That is, the wind speed and direction at the release area are constant over the application time period. The extent of importance of variations in such parameters during the application should be defined by sensitivity studies and accounted for in the definition of the SPRAYTRAN source term. For example, the advanced user may want to study the effect of using additional droplet-size categories in the computation. This example also provides a test case for the user to verify that the software and linkages are working correctly.
Figure 4. The case example detailed in Figure 4. The number of required swaths to cover the m length is computed as 44 length of area divided by the effective width of swaths , assuming no overlap of swaths. Other, larger application areas, also shown in Figure 4. The details of spray direction, wind direction, etc. There are many possible combinations involving rotation of the area, approximation of the block shape with a rectangle, and the use of relatively arbitrary application setup directions as well as ambient conditions that will produce equivalent spray applications.
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Users can confirm this for their specific applications by testing several configurations. Section 3. This example application does not account for actual local features of the selected site that could be included in an AGDISP analysis. For example, the flat terrain assumption does not account for the actual area's location in relatively complex terrain centered in a valley. Spray block are as are shown on a regional map as pink areas with the example case outlined in blue. Area is shown rotated with dimensions, wind direction, and axis direction labeled. The spray block is hectares 1.
The map above left shows the example case spray block along with and relative to a number of other spray blocks. The example spray block is rotated above right to a vertical orientation and fit to a rectangular shape with sides of about and m and ft.
Table 4. Values are based on a "best fit" of the actual area shape to a rectangular area. Characterization of the spray technology and application details defines the effective width of swath. User selected. Example case assumes the application is along i.
Defined relative to application direction. Number of swaths required to cover length of example area. Those key parameters are identified in the steps defined in the following.
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The following guidance assumes that users begin with an understanding of how to use AGDISP to conduct an analysis of their spray application. Other AGDISP parameters, not explicitly discussed here, defining the application method, materials, and field operations, must also be set properly. For the example case, these parameters are assumed to be already defined by the AGDISP setup efforts that preceded the steps shown in the following.
Step 1. If the entries have different values, they could be correct, but are in English units. Step 2 shows how to change the display between English and metric units. For the example case, the file "AdispDr. Step 2. Set default units to metric. However, to minimize the chance of incorrect units in the output files, it is recommended that AGDISP be set-up and run in metric units.
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