DERIVATION OF FORMULAE FOR VARIABLE LAG TIME
FORMUALE ARE DEVELOPED WHICH PERMIT THE COMPUTATION OF LAG TIME FOR A CATCHMENT AS A VARIABLE DEPENDENT OF FLOOD MAGNITUDE. NONLINEARITY, AS DEMONSTRATED BY THE VARIATION IN LAG, DIFFERS LITTLE FROM CATCHMENT TO CATCHMENT, AND WHAT DIFERENCE THERE IS CAN ONLY BE WEAKLY RELATED TO THE CATCHMENTS CHARACTERISTICS. A HIGHLY SIMPLIFIED ANALYSIS OF THE STREAM CHANNELS INDICATES THAT THEY ARE SUBJECT TO A NONLINEAR HYDRAULIC RESPONSE OF THE SAME ORDER OF MAGNITUDE AS THAT MEASURED IN THE CATCHMENTS AS A WHOLE. IT IS THEREFORE SUGGESTED THAT THE NONLINEARITY ASSOCIATED WITH THE CATCHMENT AREAS IS CHIEFLY THE RESULT OF THAT TO BE FOUND IN THEIR CHANNEL SYSTEMS. THE ABSOLUTE MAGNITUDE OF LAG TIME IS HIGHLY CORRELATED WITH CATCHMENT AREA AND SLOPE. THIS CORRELATION LEADS TO THE DEVELOPMENT OF THREE FORMULAE FOR USE WITH UNGAGED CATCHMENTS WHICH CLOSELY RESEMBLE THOSE DEVELOPED IN THE PAST FOR THE ESTIMATION OF A CONSTANT LAG TIME. /AUTHOR/
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Supplemental Notes:
- Vol 10, No 3, PP 225-242, 6 FIG, 2 TAB, 13 REF
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Authors:
- Askew, A J
- Publication Date: 1970-4
Media Info
- Serial:
Subject/Index Terms
- TRT Terms: Channels (Waterways); Drainage basins; Emergency response time; Floods; Hydraulics; Mathematical analysis; Reaction time; Slopes; Streams
- Uncontrolled Terms: Stream channels
- Subject Areas: Highways; Hydraulics and Hydrology;
Filing Info
- Accession Number: 00204292
- Record Type: Publication
- Files: TRIS
- Created Date: Aug 17 1970 12:00AM