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Remote Sens. 2017, 9(8), 832;

Mapping Annual Riparian Water Use Based on the Single-Satellite-Scene Approach

Department of Biosystems & Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, USA
Utah Water Research Laboratory, Utah State University, Logan, UT 84321, USA
Author to whom correspondence should be addressed.
Received: 13 June 2017 / Revised: 4 August 2017 / Accepted: 9 August 2017 / Published: 12 August 2017
(This article belongs to the Section Remote Sensing in Agriculture and Vegetation)
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The accurate estimation of water use by groundwater-dependent riparian vegetation is of great importance to sustainable water resource management in arid/semi-arid regions. Remote sensing methods can be effective in this regard, as they capture the inherent spatial variability in riparian ecosystems. The single-satellite-scene (SSS) method uses a derivation of the Normalized Difference Vegetation Index (NDVI) from a single space-borne image during the peak growing season and minimal ground-based meteorological data to estimate the annual riparian water use on a distributed basis. This method was applied to a riparian ecosystem dominated by tamarisk along a section of the lower Colorado River in southern California. The results were compared against the estimates of a previously validated remotely sensed energy balance model for the year 2008 at two different spatial scales. A pixel-wide comparison showed good correlation (R2 = 0.86), with a mean residual error of less than 104 mm∙year−1 (18%). This error reduced to less than 95 mm∙year−1 (15%) when larger areas were used in comparisons. In addition, the accuracy improved significantly when areas with no and low vegetation cover were excluded from the analysis. The SSS method was then applied to estimate the riparian water use for a 23-year period (1988–2010). The average annual water use over this period was 748 mm∙year−1 for the entire study area, with large spatial variability depending on vegetation density. Comparisons with two independent water use estimates showed significant differences. The MODIS evapotranspiration product (MOD16) was 82% smaller, and the crop-coefficient approach employed by the US Bureau of Reclamation was 96% larger, than that from the SSS method on average. View Full-Text
Keywords: tamarisk; evapotranspiration; Landsat; NDVI; Colorado River tamarisk; evapotranspiration; Landsat; NDVI; Colorado River

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Khand, K.; Taghvaeian, S.; Hassan-Esfahani, L. Mapping Annual Riparian Water Use Based on the Single-Satellite-Scene Approach. Remote Sens. 2017, 9, 832.

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