将湿地和湖泊的地表水动态与水文特征的空间变异性联系起来
Melanie K Vanderhoof1, Peter Nieuwlandt2, Heather E Golden3
1U.S. Geological Survey, Geosciences and Environmental Change Science Center, MS 980, Denver Federal Center, PO Box 25046, Denver, CO 80225, USA.
概括
湿地和湖泊的地表水稳定了河流的流动,特别是在干旱时期. 这项研究表明,包括地表水动态改善了用于预测河流排水和闪的水文模型.
科学领域:
- 水文学的水文学
- 遥感 遥感 遥感 遥感
- 环境科学 环境科学
背景情况:
- 湿地和湖泊的地表水留对河流排放的时间,持续时间和规模产生重大影响.
- 之前关于地表水对排放的影响的研究主要集中在小型,湿地密集的流域.
研究的目的:
- 开发和评估随机森林模型,用于预测美国不同流域的水文特征.
- 评估将从遥感获得的地表水动态纳入,对排放制度的模型性能的影响.
主要方法:
- 利用随机森林模型分析美国72个封闭流域的6个水文标志的空间变异性.
- 包括气象,景观和地表水动态 (来自Sentinel-1和Sentinel-2) 作为预测变量.
- 采用自动变量选择 (前选择) 来识别水文特征的关键驱动因素.
主要成果:
- 纳入水域特征的模型,包括地表水的动态,显示出与仅以气候为基础的模型相比的显著改善.
- 在六个水文特征模型中的五个中,选择了遥感衍生的洪水和湿地变量.
- 泛滥平原的洪水与减少年度闪性有关,而非泛滥平原水和孤立的湿地改善了低流量预测.
结论:
- 湿地在稳定和维持河流流量方面发挥着至关重要的作用,特别是在干旱条件下.
- 了解地表水动态对于准确的水文建模和预测极端流量事件至关重要.
- 这些发现支持将遥感数据整合到有效的湿地恢复和增强流域弹性.
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