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首页> 外文期刊>Journal of the American Water Resources Association >Spatio-Temporal Patterns of Open Surface Water in the Central Valley of California 2000-2011: Drought, Land Cover, and Waterbirds
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Spatio-Temporal Patterns of Open Surface Water in the Central Valley of California 2000-2011: Drought, Land Cover, and Waterbirds

机译：加利福尼亚中央谷地2000-2011年裸露地表水的时空格局：干旱，土地覆盖和水鸟

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摘要

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 oneyear 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.
机译：我们使用Landsat卫星图像（1）量化了2000-2011年加利福尼亚中央谷地的裸露地表水分布，（2）总结了该时间序列中裸露地表水的时空变化，以及（3）评估了影响因素开放的地表水，包括干旱和土地覆盖类型。我们还应用了图像来识别农业中水鸟的可用栖息地。我们的分析表明，在2000年至2011年期间，整个中央山谷的露天地表水在7月至10月期间有所下降。平均而言，干旱在7月，9月和10月对露天表层水具有显着的负面影响，尽管影响的程度和时间在空间上有所不同。中央山谷南部立即出现了干旱年份对开放水域的负面影响。但是，北部中央谷地有一年的时滞效应。地表水的最高比例出现在农田上，其次是湖泊，河流和溪流，但是相对比例在空间上和整个月内都变化。我们的数据与先前对中央山谷北部收获后稻米中水鸟栖息地可用性的描述一致。使用卫星跟踪水的分配，可以根据经验评估不断变化的水政策，土地利用，干旱，气候和管理对水资源的影响。

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