Study of the relationship of topographic roughness obtained from LiDAR and GPS data with the roughness coefficient n-manning
Authors
G. Colmenárez
J.E. Pardo-Pascual
L.A. Ruiz
F. Segura
Keywords:
Topographic roughness model, LIDAR technology, coefficient n-Manning, digital elevation model, average velocity of water, natural channels, flow and GPS-RTK
Abstract
One of the frequently used formulas to measure the velocity of water flow in channels are not volumetric flasks is the Manning, to it’s use be requires knowing the value of the roughness coefficient n, being at this level where they have plethora of problems related to subjectivity, difficulty and cost to obtain this coefficient by the forms traditionally used. This study demonstrates the potential that presented digital topographic roughness models obtained from LIDAR and GPS data to explain this coefficient, as being related to n Manning values calculated for 34 study parcels (sections of the Palancia river), it was found that a correlation exists between the two values. These results demonstrate the potential and are hopeful to obtained for not too distant future this coefficient in manner objective, accurate, fast, efficient and economical.
