Sediment Source Areas Sample Clauses

Sediment Source Areas. The surface area draining to each debris-flow traversal corridor is delineated from the confluence of the corridor with a fish-bearing stream. The delineated area defines a subbasin within the much larger 4th-field HUC analysis basin. Within each subbasin, the initiation sites for debris flows that can carry material to the fish-bearing stream at the subbasin mouth are identified. These are the sediment source areas for that subbasin. Ideally, leave-tree buffers intended to prevent increased rates of sediment production will be targeted for those sites from which initiated debris flows will deliver the most sediment; these buffers are intended to prevent increased rates of landsliding caused by timber harvest in those zones. To identify those zones, the source areas are ranked in terms of the proportion of material carried to the fish-bearing stream originating from each initiation site within the subbasin. The volume of material delivered to the fish- bearing stream varies from year to year; none in most years, a lot in others. Likewise, the volume potentially delivered varies across the source areas; debris flows from some sites are likely to deliver only a small volume, those from other sites can deliver a huge volume. In those years that debris flows occur, the specific sites from which they originate are unknown beforehand, but based on the modeling, it is known which sites are more or less likely to fail. To identify those sites from which increased rates of landsliding will result in the largest increased rate of sediment delivery, we account for both the likely volume of delivered material and the likelihood that a site will fail and trigger a debris flow. To do this, we rank initiation sites in terms of the estimated time-averaged volume of sediment delivered: the calculated delivery volume associated with a debris-flow event from the initiation site multiplied by the probability of initiation and delivery for a debris flow from that initiation site. Summed over all initiation sites within a subbasin, this gives the time-averaged volume of debris-flow-delivered sediment for the subbasin. The source areas are then delineated into zones based on the proportion of total time-averaged volume volume originating from within each zone, ordered from highest to lowest.
Sample 1
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Related to Sediment Source Areas

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