Slope of alluvial fans in humid regions of Japan, Taiwan and the Philippines

Saito, Kyoji; Oguchi, Takashi

doi:10.1016/j.geomorph.2005.04.006

Cited by 69 publications

(50 citation statements)

References 53 publications

(58 reference statements)

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“…The importance of sheetflood processes as opposed to channelized fluvial processes has been recognized on desert alluvial fans (Blair & McPherson 1994a), and there is growing recognition of the distinctions within massflow processes between true debris-flow processes and those associated with hyperconcentrated flows (Wells & Harvey 1987;Blair & McPherson 1994a Kostaschuk et al 1986), it is realized that distinct fan surface gradients result from different depositional processes, but the concept of a specific 'slope gap' (Blair & McPherson 1994b) between alluvial fan and river gradients has since been demonstrated to have been flawed (Kim 1995;McCarthy & Candle 1995;Harvey 2002c;Saito & Oguchi 2005). To some extent Blair & McPherson's (1994a) classification of alluvial-fan styles, based on process combinations, reinforces the traditional concept of 'wet fans and dry fans' (Schumm 1977); however, the application of that concept to a climatic association with humid and arid climates, respectively, is clearly oversimplistic.…”

Section: Processes On Alluvial Fansmentioning

confidence: 99%

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Alluvial fans: geomorphology, sedimentology, dynamics — introduction. A review of alluvial-fan research

2005

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Section: Processes On Alluvial Fansmentioning

confidence: 99%

“…Some of the papers presented at the conference were 'in press' in other publications at the time (e.g. Harvey & Wells 2003) or are being published elsewhere (Garcia & Stokes in press;Saito & Oguchi 2005;Stokes et al in press). In this volume we present a selection of the papers presented at the Sorbas meeting that spans a wide range of alluvial fan research.…”

mentioning

confidence: 99%

Alluvial fans: geomorphology, sedimentology, dynamics — introduction. A review of alluvial-fan research

2005

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“…The rectangles indicate the location of Figures 4,[7][8][9][10][11][12] only be verified through excavation, which did not happen to this day. No further archaeological surveys have been conducted in the area since the 1970s.…”

Section: Archaeologymentioning

confidence: 99%

“…Fan J3 is smaller, but Arzani [74] suggested that smaller megafans may develop in semi-arid settings, owing to sediment availability and flash flooding. In addition, Saito and Oguchib [7] demonstrated that spatial and temporal variability of geomorphological processes are reflected in a continuous spectrum of fan morphological parameters. The same study showed a negative correlation between fan size and gradient.…”

Section: Comparison To Other Fluvial-dominated Fansmentioning

confidence: 99%

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Assessing human impact on alluvial fan development: a multidisciplinary case-study from Lower Khuzestan (SW Iran)

2010

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This paper presents a multidisciplinary approach for studying the evolution of an alluvial fan system in Lower Khuzestan (SW Iran). The study draws on previously collected data from geological and archaeological field campaigns and new data derived from the interpretation of satellite imagery and historical textual sources. Three alluvial fans were identified, successively deposited by the Jarrahi river in progressively downstream/westward direction. Judging from archaeological and historical evidence, the successive phases appear to coincide with a relocation of settlement and irrigation activities. The distributary system of the present-day fan developed over a period of less than four centuries. It is suggested that management of levee breaks by man played a key role in such rapid fan development and in maintaining extremely low gradients. Judging from the extensive patterns of ancient irrigation canals, human activity also played an important role in the formation of the earlier fans.

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Elucidating the geometry of the active Shanchiao Fault in the Taipei metropolis, northern Taiwan, and the reactivation relationship with preexisting orogen structures

et al. 2014

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The Shanchiao Fault is an active normal fault with documented paleoearthquakes in the Taipei metropolis, Taiwan. While posing direct seismic threat on the multimillion population, its crustal-scale fault plane configuration has not been constrained. This study presents the first attempt to resolve the fault plane dip changes of the Shanchiao Fault within the upper crust by forward modeling late Quaternary deformation. Tectonic subsidence over the last~23 ka is estimated from vertical displacements of a rapidly formed alluvial fan horizon deformed into a dramatic rollover monocline. A 2-D profile across the Shanchiao Fault is chosen for elastic half-space dislocation modeling, and the results suggest that the fault is listric in the shallow crust with an abrupt change from subvertical ramp (85°-75°) to near-horizontal flat (10°-15°) at 3-4 km depth, consistent with an origin from the inversion of an orogen-related thrust detachment. Given the presence of rift-related fabrics in the underthrust Chinese Continental Margin basement beneath the Taiwanese orogenic wedge, listric ramp-flat-ramp models with a second deeper bend to 60°dip are also tested. Reasonable fits with the geological observations are produced when the lower ramp is located at greater than 8 km depth, which correlates with the hypocentral location of a moderate earthquake in 2004. Joint reactivation of preexisting thrust and rift faults by the Shanchiao Fault is therefore plausible with implications for seismic hazard in the Taipei area.

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Slope of alluvial fans in humid regions of Japan, Taiwan and the Philippines

Cited by 69 publications

References 53 publications

Alluvial fans: geomorphology, sedimentology, dynamics — introduction. A review of alluvial-fan research

Alluvial fans: geomorphology, sedimentology, dynamics — introduction. A review of alluvial-fan research

Assessing human impact on alluvial fan development: a multidisciplinary case-study from Lower Khuzestan (SW Iran)

Elucidating the geometry of the active Shanchiao Fault in the Taipei metropolis, northern Taiwan, and the reactivation relationship with preexisting orogen structures

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