Abstract A new methods were presented to estimate streamflow with the aid of low-cost optical, infrared, and microwave imagery in a controlled experimental hydraulic channel. The River Experiment Center in Andong, Korea was used as a test site for calibration and validation. The suggested methodologies uses the remotely sensed channel width and the derived channel cross sections coupled with simple hydraulic models. Two basic models were applied for comparison; 1) the Manning’s equation for uniform flow analysis and 2) an iterative method based on the energy equation that assumes non-uniform flow. The non-uniform condition for the 2nd method is achieved by using a water structure, specifically, a weir, to form a backwater effect. Under the assumption of ideal uniform flow, both methods show similarly reasonable performance, with 14.5% error on average against the in-situ channel flow observations. However, under non-uniform flow, the uniform flow approach, i.e., the 1st method, exhibits overestimated channel flow (62.6% error) compared to the non-uniform analysis method, i.e., the 2nd method (15.8% error on average).
Flow Estimation using Drone Optical Imagery with Non-uniform Flow Modeling in a Controlled Experimental Channel
KSCE Journal of Civil Engineering ; 23 , 4 ; 1891-1898
2019-01-14
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
FLOW ESTIMATION METHOD OF STREAMS BASED ON NON-UNIFORM FLOW WITH REMOTE SENSED IMAGERY
Europäisches Patentamt | 2020
|