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Investigating the spatial distribution of water levels in the Mackenzie Delta using airborne LiDAR by C. Hopkinson; N. Crasto; P. Marsh; D. Forbes; L. Lesack is a Environmental Science article available to read on EtoBox.

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## Abstract Airborne light detection and ranging (LiDAR) data were used to map water level (WL) and hydraulic gradients (δH/δx) in the Mackenzie Delta. The LiDAR WL data were validated against eight independent hydrometric gauge measurements and demonstrated mean offsets from − 0·22 to + 0·04 m (σ< 0·11). LiDAR‐based WL gradients could be estimated with confidence over channel lengths exceeding 5–10 km where the WL change exceeded local noise levels in the LiDAR data. For the entire Delta, the LiDAR sample coverage indicated a rate of change in longitudinal gradient (δ^2^H/δx) of 5·5 × 10^−10^ m m^−2^; therefore offering a potential means to estimate average flood stage hydraulic gradient for areas of the Delta not sampled or monitored. In the Outer Delta, within‐channel and terrain gradient measurements all returned a consistent estimate of − 1 × 10^−5^ m m^−1^, suggesting that this is a typical hydraulic gradient for the downstream end of the Delta. For short reaches ( 0·1 m was observed at a channel constriction entering a meander bend, suggesting a localized modification of the channel hydraulics. Furthermore, water levels in the anabranch channels of the Peel River were almos

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Author

C. Hopkinson; N. Crasto; P. Marsh; D. Forbes; L. Lesack

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0885-6087)

Published

2011

Language

EN

Field

Environmental Science (Physical Sciences)