Fluvial geomorphology and paleohydrology in Japan

Oguchi, Takashi; Saito, Kyoji; Kadomura, Hiroshi; Grossman, Michael

doi:10.1016/s0169-555x(01)00048-4

Cited by 115 publications

(64 citation statements)

References 49 publications

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“…The Japanese Islands lie on monsoonal mountainous regions in a young orogenic belt, and Japanese mountains are mainly formed by accretionary wedges and volcanic rocks younger than the Jurassic. Oguchi et al (2001) characterized Japanese landforms by steep watersheds, heavy storms, frequent slope failures and landslides, large flood discharge and efficient sediment transport, high sediment yields, and catastrophic hydro-geomorphological events associated with earthquakes and volcanic eruption plains. There are very few or no distributions of erosional plains, glacial landforms, and Eolian landforms in Japan.…”

Section: Regional Differences and Future Scopementioning

confidence: 99%

Global terrain classification using 280 m DEMs: segmentation, clustering, and reclassification

Iwahashi

Kamiya²,

Matsuoka

et al. 2018

Prog Earth Planet Sci

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Polygon-based terrain classification data were created globally using 280 m digital elevation models (DEMs) interpolated from the multi-error-removed improved-terrain DEM (MERIT DEM). First, area segmentation was performed globally with the logarithmic value of slope gradient and the local convexity calculated from the DEM. Next, by adding surface texture, k-means clustering was performed globally and the polygons were grouped into 40 clusters. Then, we tried to reclassify these 40 clusters into geomorphologic terrain groups. In this study, we attempted reclassification and grouping using local information from Japan as a test case. The 40 clusters were compared with Japanese geological and geomorphological data and were then reclassified into 12 groups that had different geomorphological and geological characteristics. In addition, large shape landforms, mountains, and hills were subdivided by using the combined texture. Finally, 15 groups were created as terrain groups. Cross tabulations were performed with geological or lithological maps of California and Australia in order to investigate if the Japanese grouping of the clusters was also meaningful for other regions. The classification is improved from previous studies that used 1-km DEMs, especially for the representation of terrace shapes and landform elements smaller than 1 km. The results were generally suitable for distinguishing bedrock mountains, hills, large highland slopes, intermediate landforms (plateaus, terraces, large lowland slopes), and plains. On the other hand, the cross tabulations indicate that in the case of gentler landforms under different geologic provinces/climates, similar topographies may not always indicate similar formative mechanisms and lithology. This may be solved by locally replacing the legend; however, care is necessary for mixed areas where both depositional and erosional gentle plains exist. Moreover, the limit of the description of geometric signatures still appears in failure to detect narrow valley bottom plains, metropolitan areas, and slight rises in gentle plains. Therefore, both global and local perspectives regarding geologic province and climate are necessary for better grouping of the clusters, and additional parameters or higher resolution DEMs are necessary. Successful classification of terrain types of geomorphology may lead to a better understanding of terrain susceptibility to natural hazards and land development.

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Section: Regional Differences and Future Scopementioning

confidence: 99%

Global terrain classification using 280 m DEMs: segmentation, clustering, and reclassification

Iwahashi

Kamiya²,

Matsuoka

et al. 2018

Prog Earth Planet Sci

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“…Alluvial fans in central Asia can be classified into two basic types: dissected and undissected; most dissected fans are composed of Pleistocene surfaces; whereas, most undissected fans are composed of late Pleistocene and Holocene surfaces (XETCAS, 1978). The distribution of fan surfaces formed in the mid-Pleistocene or earlier is much more limited (Oguchi et al, 2001). Well-preserved old surfaces are confined to areas where fan surfaces are being tilted rapidly toward fan apexes because of the relative uplift of fan toes.…”

Section: Evidences From Desert Plains (Gobi) and Alluvial Sedimentationmentioning

confidence: 99%

Climate-Driven Landformof the Ejina Basin (NW China) in Central Asia and Its Paleoenvironmental Implications

Zhu¹

2015

ESR

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Though neotectonic activity is believed to be the major factor in the evolution of the topography of the Ejina Basin in Central Asia, detailed documentation and analysis of climatic landscape features and their environmental implications are lacking. The present study is a site-specific documentation of landforms developed in the wide part of the Ejina Basin, with the aim to identify the climatic landforms based on the method of climatic geomorphology and to evaluate its landscape evolution and response to palaeoclimate changes. The morphodynamics of older landscapes are recognized by making comparison with the present climate and its corresponding landscapes. Clear evidences testifying the basin-scale shifting and transformation of different morphoclimatic zones in the basin are observed, which prove that the main geomorphic unit is changed from an alluvial-lacustrine plain to a desert plain. The coexistence of diverse landscapes and the consequent geomorphodiversity in the basin should be a compound result of surficial processes other than glaciations. The climate and hydrological conditions of the basin during the last glaciation and during the Early Holocene were much better than at present, possibly having an average annual precipitation ranged between 60~350 mm on the basin during ca. 39-23 ka BP but great fluctuations during Holocene. The periods of lower aridity during the late Pleistocene in the bain could be induced by an increase of the westerlies and a weakening of the Asian winter monsoon on the arid areas of the central Asia.

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“…The Japanese archipelago has a unique combination of geologic, geomorphic, and climatic features including relatively recent geology, complex geomorphology, and frequently heavy rains [14], such that groundwater resources are mainly contained in Quaternary aquifer systems deposited in Tertiary vessels [15]. Therefore, it is very important to understand the geochemical processes that control groundwater quality within Quaternary aquifer systems in Japan.…”

Section: Study Sitementioning

confidence: 99%

An Estimate of Energy Available via Microbial Sulfate Reduction at a Quaternary Aquifer in Northern Japan considered for Low Temperature Thermal Energy Storage

Ioka

Muraoka

2014

Water

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Abstract:The energy available via microbial sulfate reduction was estimated for a Quaternary aquifer in northern Japan that is a candidate site for low temperature aquifer thermal energy storage. In evaluating whether microbial sulfate reduction proceeded or ceased, it was assumed that electron donor/acceptor concentrations were unchanged by temperature increase. The estimated energy availability via microbial sulfate reduction at 9 °C with no thermal disturbance was 37, 51, and 53 kJ·(mol SO at 60 °C. These results indicate that possible energy availability via microbial sulfate reduction at approximately 40-60 °C exceeded the range of available energy (compiled from previous studies) at which sulfate reduction would cease. Thus, microbial sulfate reduction at this site may proceed at approximately 40-60 °C.

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Fluvial geomorphology and paleohydrology in Japan

Cited by 115 publications

References 49 publications

Global terrain classification using 280 m DEMs: segmentation, clustering, and reclassification

Global terrain classification using 280 m DEMs: segmentation, clustering, and reclassification

Climate-Driven Landformof the Ejina Basin (NW China) in Central Asia and Its Paleoenvironmental Implications

An Estimate of Energy Available via Microbial Sulfate Reduction at a Quaternary Aquifer in Northern Japan considered for Low Temperature Thermal Energy Storage

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