Streamflow response to drought in a managed coast redwood catchment

IF 2.6 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Journal of The American Water Resources Association Pub Date : 2024-06-23 DOI:10.1111/1752-1688.13211
Elizabeth Keppeler, Joseph Wagenbrenner, Salli Dymond, David Dralle
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Abstract

A 60-year precipitation and streamflow record from the Caspar Creek Experimental Watersheds in northern California was used to explore the propagation of meteorological drought to hydrological drought. Standardized precipitation and runoff indices were calculated for the two forested catchments using integration periods of 12, 24, and 36 months. The resulting time series were used to define three severe drought events (1976–1977, 2013–2014, and 2020–2022). The earliest drought followed the 1971–1973 harvest of the 417 ha South Fork (SF) watershed, a second followed the 1989–1992 harvest of the 479 ha North Fork watershed, and a third followed the 2017–2019 reentry harvest of the SF. From these time series, we calculated drought metrics and anomalies to model differences in catchment responses in the context of climate and management. The meteorological drought in the 1977 event was more severe and extreme than the streamflow response. Both of the 21st Century droughts were hydrologically more severe than the 1977 drought. Timber harvest initially shortened and reduced streamflow drought (1977 and 2021) but prolonged and intensified the 2014 streamflow drought. Declining fall precipitation has reduced streamflows, thereby impeding salmonid migration and exacerbating impacts on native fish. Our results provide new insights into the role of climate variation, particularly long-term and seasonal drought dynamics, in managed forests along the North American Pacific coast.

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受管理的海岸红杉集水区的溪流对干旱的反应
利用加利福尼亚州北部卡斯帕尔溪实验流域 60 年的降水和溪流记录,探讨了气象干旱向水文干旱的传播。利用 12、24 和 36 个月的整合期计算了两个森林集水区的标准化降水和径流指数。由此得出的时间序列被用来定义三次严重干旱事件(1976-1977 年、2013-2014 年和 2020-2022 年)。最早的干旱发生在 1971-1973 年 417 公顷南叉流域的采伐之后,第二次干旱发生在 1989-1992 年 479 公顷北叉流域的采伐之后,第三次干旱发生在 2017-2019 年南叉流域的重新采伐之后。根据这些时间序列,我们计算了干旱指标和异常值,以模拟在气候和管理背景下集水区反应的差异。1977 年事件中的气象干旱要比溪流反应更为严重和极端。21 世纪的两次干旱在水文上都比 1977 年的干旱更为严重。木材采伐最初缩短并减轻了溪流干旱(1977 年和 2021 年),但延长并加剧了 2014 年的溪流干旱。秋季降水量的减少导致溪流减少,从而阻碍了鲑鱼的洄游,加剧了对本地鱼类的影响。我们的研究结果为了解气候变异,特别是长期和季节性干旱动态在北美太平洋沿岸森林管理中的作用提供了新的视角。
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来源期刊
Journal of The American Water Resources Association
Journal of The American Water Resources Association 环境科学-地球科学综合
CiteScore
4.10
自引率
12.50%
发文量
100
审稿时长
3 months
期刊介绍: JAWRA seeks to be the preeminent scholarly publication on multidisciplinary water resources issues. JAWRA papers present ideas derived from multiple disciplines woven together to give insight into a critical water issue, or are based primarily upon a single discipline with important applications to other disciplines. Papers often cover the topics of recent AWRA conferences such as riparian ecology, geographic information systems, adaptive management, and water policy. JAWRA authors present work within their disciplinary fields to a broader audience. Our Associate Editors and reviewers reflect this diversity to ensure a knowledgeable and fair review of a broad range of topics. We particularly encourage submissions of papers which impart a ''take home message'' our readers can use.
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