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Floodplain and Terrace Legacy Sediment as a Widespread Record of Anthropogenic Geomorphic Change
Annals of the American Association of Geographers ( IF 3.982 ) Pub Date : 2020-12-17
L. Allan James, Timothy P. Beach, Daniel D. Richter

Anthropogenic erosion and sedimentation are critical components of global change that involve life-sustaining natural resources of soil and water. Many geomorphic systems have responded to intense land use disturbance with episodic erosion and sedimentation, often orders of magnitude greater than background geological rates in the Holocene. Accelerated sedimentation is a metric for land use change and provides evidence of geomorphic change in fans, floodplains, terraces, deltas, lakes, karst sinks, estuaries, and coastal marine deposits. This review describes high variability in the timing of alluvial sedimentation and the value of bottomland stratigraphy with emphasis on records and heterogeneity of anthropogenic change. Although floodplain sedimentary evidence might be ill-suited for defining the proposed Anthropocene epoch boundary based on stratigraphic boundary criteria, sedimentology and stratigraphy provide rich evidence for long-term human activities that measures buildups of human environmental alterations long before the proposed mid-twentieth-century onset of the Anthropocene. Anthropogenic sedimentation is globally widespread but is too time-transgressive to serve as a stratigraphic indicator for onset of the proposed Anthropocene epoch. The emphasis here is on an example of longue durée; that is, the long record of anthropogenically accelerated sedimentation and the valuable evidence that it provides of human-induced environmental change. A conceptual tripartite model summarizes the evolution of anthropogeomorphic change. Anthropogenic sediments preserve geoarchaeological evidence and other important contextual information in buried landscapes that include human infrastructure, fields, material culture, contaminants, and paleosols. Geomorphic change can threaten food production, flooding, water quality, and so on. Understanding erosion and sedimentation dynamics is a vital concern for humanity.



中文翻译:

洪泛区和阶地遗留沉积物是人为地貌变化的广泛记录

人为侵蚀和沉积是全球变化的关键组成部分,涉及维持生命的土壤和水的自然资源。许多地貌系统通过剧烈的侵蚀和沉积对强烈的土地利用扰动作出了反应,通常比全新世的背景地质速率高几个数量级。加速沉积是土地利用变化的度量标准,并提供了扇形,洪泛区,阶地,三角洲,湖泊,岩溶汇,河口和沿海海洋沉积物地貌变化的证据。这篇评论描述了冲积沉积时间和底地层的价值的高度可变性,重点是人为变化的记录和非均质性。尽管洪泛区的沉积证据可能不适合根据地层学边界标准来定义拟人世的时代边界,但沉积学和地层学为长期人类活动提供了丰富的证据,这些活动可在拟议的20世纪中期之前测量人类环境变化的累积始于人类世。人为沉积在全球范围内很普遍,但是时间跨度太高,无法作为拟议的人类世纪开始的地层指示。这里的重点是一个例子 人为沉积在全球范围内很普遍,但是时间跨度太高,无法作为拟议的人类世纪开始的地层指示。这里的重点是一个例子 人为沉积在全球范围内很普遍,但时间跨度太高,无法作为拟议的人类世纪开始的地层指示。这里的重点是一个例子durée贵族; 也就是说,人为加速沉积的长期记录及其提供的人为环境变化的宝贵证据。一个概念性的三方模型总结了拟人化变化的演变。人为沉积物保留了埋藏景观中的地质考古证据和其他重要的背景信息,包括人类基础设施,田野,物质文化,污染物和古土壤。地貌变化会威胁到粮食生产,洪水,水质等。了解侵蚀和沉积动力学是人类至关重要的问题。

更新日期:2020-12-17
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