Fluvial system response to external forcing and human impact – Late Pleistocene and Holocene fluvial dynamics of the lower Guadalete River in western Andalucía (Spain)
Fluvial system response to external forcing and human impact – Late Pleistocene and Holocene fluvial dynamics of the lower Guadalete River in western Andalucía (Spain)
复制标题
河流系统对外部强迫和人类影响的响应â安达卢西亚西部瓜达莱特河下游的晚更新世和全新世河流动力学（西班牙）
作者：
瓜达莱特河170公里长的河道（Andalucía西部）为晚更新世和全新世的河流沉积动力学提供了极好的记录。此外，其河漫滩沉积物非常适合描述由气候波动、海平面变化、构造影响和人类活动造成的地貌变化。多代理调查基于野外测绘和18个剖面剖面的研究，主要包括沉积学特征、土壤化学分析和34个样品的放射性碳定年。通过钻井和电阻率层析成像对研究结果进行了补充。根据泥沙保存条件的不同，将河段最下端50公里分为上下两段（各25公里长）。该边界对应于晚更新世河阶地的消失。显著的洪泛平原沉积发生在大约10000 cal. years BP，而动力学受到海平面波动的强烈影响，直到全新世早期。此外，从8000、6100、4600、2200、900和400 cal. years BP开始的沉积与气候波动（即干旱化）引发的环境压力导致的河流动力学增强有关。然而，400 cal. years BP的最强沉积强度表明小冰期期间的气候异常。相比之下，与冲积土形成相关的几个稳定时期发生在Bølling和Allerød间冰期，在8000、6100和5100之前，以及4300和2000 cal. years BP之后。洪泛平原演化过程中的人为信号与气候信号不能明显区分。然而，人类土地利用有可能放大地貌过程，特别是在气候恶化期间，对环境造成越来越大的压力。
The 170 km long river course of the Guadalete River (western Andalucía) provides an excellent record of Late Pleistocene and Holocene fluvial sedimentation dynamics. Furthermore, its floodplain sediments are very well suited to describe geomorphic changes forced by climate fluctuations, sea‐level changes, tectonic influences and human activity. Multiproxy investigations were based on field mapping and the study of 18 profile sections, mainly including sedimentological characterisation, soil‐chemical analyses and radiocarbon dating of 34 samples. Findings were complemented by drillings and electrical resistivity tomography. The lowermost 50 km of the river section are divided into an upper and lower part (each 25 km long), based on different sediment preservation conditions. The boundary corresponds to the disappearance of the Late Pleistocene river terrace. Significant floodplain aggradation occurred at around 10 000 cal. years BP, while dynamics were strongly affected by sea‐level fluctuations until the early Holocene. Furthermore, sedimentation starting at 8000, 6100, 4600, 2200, 900 and 400 cal. years BP is related to enhanced fluvial dynamics due to environmental stress that presumably was triggered by climate fluctuations, that is, aridification. However, the strongest intensity of sedimentation at 400 cal. years BP points to climate anomalies in the course of the Little Ice Age. In contrast, several periods of stability associated with alluvial soil formation took place during the Bølling and Allerød interstadials, prior to 8000, 6100 and 5100, and after 4300 and 2000 cal. years BP. The anthropogenic signal in floodplain evolution is not clearly distinguishable from that of climate. However, human land use had the potential to amplify geomorphic processes, especially during periods of climate deteriorations that caused increasing stress on the environment.
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西班牙西南部加的斯坎皮尼亚地中海泥灰景观中的土壤侵蚀过程和沉积物通量
影响因子：
2.2
作者：
D. Faust;Michael Schmidt
通讯作者：
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DOI：
--
发表时间：
1998
期刊：
影响因子：
--
作者：
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通讯作者：
M. Wright
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DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
J. Goy;C. Zazo;C. Dabrio;J. Lario;F. Borja;F. Sierro;J. Flores
通讯作者：
J. Flores
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DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
J. Gutiérrez;F. Hernández‐Molina;F. López
通讯作者：
F. López
全新世期间瓜达伦丁凹陷（西班牙东南部）从冲积系统向河流系统的转变：洛尔卡范与瓜达伦丁河
影响因子：
3.9
作者：
P. Silva;T. Bardají;M. Calmel;J. Goy;C. Zazo
通讯作者：
C. Zazo