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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Geomorphological response of fluvial and coastal terraces to Quaternary tectonics and climate as revealed by geostatistical topographic analysis
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Geomorphological response of fluvial and coastal terraces to Quaternary tectonics and climate as revealed by geostatistical topographic analysis

机译：地质统计地形分析揭示的河流和沿海阶地对第四纪构造和气候的地貌学响应

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摘要

Geostatistical topographic analysis is widely recognized as a useful tool for the statistical reconstruction of planar geomorphic markers from relict surfaces. This work is aimed at improving the geostatistical approach used in previous works and developing a method for evaluating the incision rates of rivers in their lower catchments during the Late Quaternary. We chose the major valleys of the Adriatic foothills (central Italy), affected since Late Miocene by a differential tectonic uplift which is still active. In particular, (i) we applied the geostatistical analysis to reconstruct the original top-surfaces of fluvial-to-coastal terrace bodies at the Metauro River and Cesano River mouths; (ii) we performed correlations between the height distribution of the alluvial terrace sequences and the Quaternary climatic curve to estimate the average long-term fluvial incision rates in the lowermost reaches of the Metauro, Cesano, Misa and Esino Rivers. The obtained averaged incision rates have been interpreted also in the light of the Stream-Length Gradient Index (SL Index), Steepness Index (K(s)), and Concavity Index (theta) as proxies of the stream-power per unit length. Results confirm that geostatistical and terrain analysis of topographic and geometric arrangements of fluvial and coastal terraces is an effective tool in detecting geomorphic and tectonic factors inducing perturbations on planar geomorphic markers. In particular, we better delineated the surface geometry and boundaries of well-developed coastal fans at the mouths of the Metauro and Cesano Rivers, already recognized in previous works through sedimentological, morphostratigraphic, and chronological data. Moreover, we found evidence for cut-and-fill phases that took place during and immediately after the river aggradation of the late Quaternary glacial periods. Despite the Slope-Area analysis evidenced a widespread influence of the regional differential uplift on single river basin configuration, we observed some space and time variability of averaged incision rates for adjacent valleys, mainly explained by physiographic configuration and dynamics of drainage network.
机译：地统计地形分析是从遗迹表面统计重建平面地貌标记的有用工具。这项工作旨在改进以前工作中使用的地统计方法，并开发一种方法来评估第四纪晚期河流下游流域的切开率。我们选择了亚得里亚山丘陵的主要山谷（意大利中部），该地区自中新世以来受到构造活动的持续抬升影响。特别是，（i）我们应用了地统计分析来重建梅塔罗河和切萨诺河河口到河流到沿海阶地的原始顶面; （ii）我们在冲积阶地序列的高度分布与第四纪气候曲线之间进行了相关性，以估算Metauro河，Cesano河，Misa河和Esino河的最下游河流的平均长期河川切开率。还已经根据流长梯度指数（SL指数），陡度指数（K（s））和凹度指数（θ）解释了获得的平均切入率，作为每单位长度的流功率的代理。结果证实，河流和沿海阶地的地形和几何布置的地统计和地形分析是检测引起地平面标志物扰动的地貌和构造因素的有效工具。特别是，我们更好地描绘了Metauro河和Cesano河口处发达的沿海扇形体的表面几何形状和边界，这在先前的研究中已经通过沉积学，地层学和年代学数据得到了认可。此外，我们发现了第四纪晚期冰川消融期间和之后发生的填挖阶段的证据。尽管边坡面积分析显示了区域差异性隆起对单个流域构造的广泛影响，但我们观察到了邻近山谷平均切入率的时空变化，这主要是由生理构造和排水网络的动力学解释的。

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