کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9524857 | 1635610 | 2005 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Slope of alluvial fans in humid regions of Japan, Taiwan and the Philippines
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Slope of alluvial fans in humid regions of Japan, Taiwan and the Philippines Slope of alluvial fans in humid regions of Japan, Taiwan and the Philippines](/preview/png/9524857.png)
چکیده انگلیسی
This study constructed a database for 690 alluvial fans in humid regions of Japan, Taiwan and the Philippines, and analyzed their slopes and other morphometric parameters such as the area and relief ratio of the source area. This type of comprehensive geomorphological research on alluvial fans in humid regions has been limited, although numerous studies have dealt with fans in arid and semi-arid regions. Semi-conical depositional landforms larger than 2 km2 and steeper than 0.11° (0.002 m/m) were selected as alluvial fans. About 60% of the fans formed during the Holocene and the rest (40%) formed during the Pleistocene. Mean fan slopes for both all the Quaternary fans and Holocene fans follow a lognormal frequency distribution. The distribution also fits slopes of fans belonging to a certain areal range. The area and relief ratio of the source area, which correlate well with the fan slope, also follow a lognormal distribution, indicating the dimensions of fan/basin systems vary gradually rather than abruptly. These findings contrast with a previous notion that depositional landforms rarely have slopes of 0.5° (0.009) to 1.5° (0.026) and hence only semi-conical landforms steeper than 1.5° should be called alluvial fans.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volume 70, Issues 1â2, August 2005, Pages 147-162
Journal: Geomorphology - Volume 70, Issues 1â2, August 2005, Pages 147-162
نویسندگان
Kyoji Saito, Takashi Oguchi,