Spatio-Temporal Patterns of Open Surface Water in the Central Valley of California 2000-2011: Drought, Land Cover, and Waterbirds

• Published in: Journal of the American Water Resources Association Vol. 51; no. 6; pp. 1722 - 1738
• Main Authors: Reiter, Matthew E., Elliott, Nathan, Veloz, Sam, Jongsomjit, Dennis, Hickey, Catherine M., Merrifield, Matt, Reynolds, Mark D.
• Format: Journal Article
• Language: English
• Published: Middleburg Blackwell Publishing Ltd 01.12.2015
• Subjects: Agricultural land; Agricultural management; Aquatic birds; Central Valley; Distribution; Drought; Droughts; Environmental policy; Habitat availability; Habitats; Imagery; Lakes; Land cover; Land use; Landsat; Landsat satellites; Policies; Remote sensing; Resource management; Rivers; Satellite imagery; Satellite tracking; Satellites; Spaceborne remote sensing; Streams; Surface water; Temporal variations; trend; Valleys; water; Water distribution; Water engineering; Water policies; Water policy; Water resources; waterbirds; Waterfowl; Central Valley; United States > US; California; INE, USA, California; USA, California, Central Valley
• ISSN: 1093-474X; 1752-1688
• DOI: 10.1111/1752-1688.12353

We used Landsat satellite imagery to (1) quantify the distribution of open surface water across the Central Valley of California 2000‐2011, (2) summarize spatio‐temporal variation in open surface water during this time series, and (3) assess factors influencing open surface water, including drought and land cover type. We also applied the imagery to identify available habitat for waterbirds in agriculture. Our analyses indicated that between 2000 and 2011 open surface water has declined across the Central Valley during the months of July‐October. On average, drought had a significant negative effect on open surface water in July, September, and October, though the magnitude and timing of the effect varied spatially. The negative impact of a drought year on open water was experienced immediately in the southern Central Valley; however, there was a one year time‐lag effect in the northern Central Valley. The highest proportion of open surface water was on agricultural lands followed by lakes, rivers, and streams, yet the relative proportions varied spatially and across months. Our data were consistent with previous descriptions of waterbird habitat availability in post‐harvest rice in the northern Central Valley. Tracking water distribution using satellites enables empirically based assessments of the impacts of changing water policy, land‐use, drought, climate, and management on water resources.