Controlling transportation expenditures and wood flow

At this point the model has only applied a single treatment to a single block. Even so, we can take a look at the target charts to track what accounts this volume contributed to and how the expenditures were tracked.

[Note]Note

Let's explore the objectives set for the harvest quotas and transportation expenditures by navigating through the Targets tab and opening the Target Charts.

  1. Select the Targets tab from the Patchworks panel.

  2. Click on the '+' icon next to the Products folder to expand all the sub-folders. Navigate through the following folders:

    1. product -> Mill1 -> Yield -> Conif

    2. product -> Mill1 -> Yield -> Decid

    3. product -> Mill2 -> Yield -> Conif

    A coloured dot and a target name represents the end of the hierarchy and clicking here will open the target chart associated with this account.

[Tip]Tip

Targets in the target tree have a coloured circle beside the target name. The colour of the circle represents the status of the target:

  • Green = target active

  • Red = target inactive

These three accounts are tracking the amount of wood by product that is harvested and sent to each destination (MILL1 or MILL2). Each bar in the histogram represents a planning period in the model (5 years each). The height of the red bars represents the minimum objective for the harvest quotas.

Only two black lines appear in the fourth period for the

The scheduler had a choice when it harvested our block to send the products to Mill1 or Mill2. By looking at the target charts we can see that the scheduler chose to send all products to Mill1. We can close the product.Mill2.Yield.Conif target chart since our block is not contributing any volume there.

[Note]Note

To see exactly how much volume was harvested and sent to Mill1 hold your mouse over the fourth period bar where the black line appears. The value will appear in the middle grey box at the bottom of the target chart. By default the target charts display values periodically but can be changed to show the annual values.

To change the target chart display to annual click the icon. To change back to period values click the icon.

Block 13352 contributed 79.2m3 of deciduous volume and 1304.79m3 of conifer volume during planning period 4.

To see how much it cost to get this wood to the mill we can open some additional target charts that represent the transportation expenditures.

[Note]Note

Navigate through the target directory again in the Route folder to find the following accounts.

  1. route.Total.build

  2. route.Total.haul

  3. route.Total.repair

Again, black lines appear in the fourth bar of each target chart. The height of the blue bars represent the maximum objective for the targets (ie. try to keep the expenditures below the level of the blue bars). The value of the black line represents the cost to haul this wood ($9,516), to maintain the roads that were used ($14,351) and to build any new road segments ($3,921). The road maintenance cost seems excessively high for this small amount of harvest. Typically these charges will be amortized over a much larger harvest and the cost per unit will be substantially lower.

So far we have seen two sets of objectives that are controlling the model; one for harvest quotas and another for transportation expenditures. These two sets of objectives are working together and in competition to obtain a sustainable wood supply from the management unit while simultaneously attempting to reduce costs and thus the management footprint on the landscape.

Before we start the scheduler, lets look at an additional objective that can further help to reduce the fragmentation of harvest blocks and consolidate the roading pattern. It's time to explore the harvest patch objectives for the Crowsnest Pass.