More flow upstream and less flow downstream: The changing form and function of global rivers

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2024-12-12 DOI:10.1126/science.adl5728

Dongmei Feng, Colin J. Gleason

引用次数: 0

Abstract

We mapped daily streamflow from 1984 to 2018 in approximately 2.9 million rivers to assess recent changes to global river systems. We found that river outlets were dominated by significant decreases in flow, whereas headwaters were 1.7 times more likely to have significantly increased flow than decreased. These changes result in a significant upstream shift in streamflow experienced by about 29% of the global land surface. We found the most changes in the smallest steams in our study: increases in erosion potential (approximately 5% increase in stream power), flood frequency (approximately 42% increase in 100-year floods), and likely nutrient dynamics (altered seasonal flow regimes). We revealed these changes using “detail at scale” by mapping millions of individual rivers. Widely adopting this approach could reveal other changes to the hydrosphere.

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上游多，下游少：全球河流形态与功能的变化。

我们绘制了1984年至2018年约290万条河流的日流量图，以评估全球河流系统的近期变化。我们发现，河流出口以流量显著减少为主，而源头流量显著增加的可能性是流量显著减少的1.7倍。这些变化导致大约29%的全球陆地表面经历了显著的上游流移。在我们的研究中，我们发现最小的蒸汽变化最大：侵蚀潜力增加（水流功率增加约5%），洪水频率增加（百年一遇的洪水增加约42%），以及可能的营养动态（改变的季节性流量制度）。我们通过绘制数百万条河流的地图，用“尺度细节”揭示了这些变化。广泛采用这种方法可以揭示水圈的其他变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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