Environmental Engineering Reference
In-Depth Information
Fig. 10.7
HEC-DSS importer interface from SWAT outputs
the HEC-RAS model's domain as its boundary conditions. The HEC-RAS model
is then calibrated based on measured in-stream flow, sediment and nutrient con-
centrations. The goal is not only to characterize each of those features but
sequentially to link them together as part of a systematic evaluation of the large
river basin based on a defined set of conditions.
Table
10.1
describes the state variables that SWAT passes to the HEC-RAS
model. The state variables required for HEC-RAS are passed from SWAT using
HEC-DSS. As shown in Table
10.1
, SWAT provides daily time-series for flow and
contaminant loads for HEC-RAS.
Table 10.1 SWAT state variables passed to HEC-RAS
SWAT source
HEC-RAS input
Unit
Flow
Flow
cms
Suspended sediment
Suspended sediment
ton/day
NH
4
-N
NH
4
-N
kg/day
NO
3
-N
NO
3
-N
kg/day
NO
2
-N
NO
2
-N
kg/day
Organic N
Organic N
kg/day
PO
4
-P
PO
4
-P
kg/day
Organic P
Organic P
kg/day
Algae
Algae
kg/day
DO
DO
kg/day
CBOD
CBOD
kg/day
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