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Channel Change and Bed-Material Transport in the Lower Chetco River, Oregon: Open-File Report 2009-1163 by Rose J. Wallick, United U. S. Department of the Interior, Et Al - Paperback
69.30 درهم

Channel Change and Bed-Material Transport in the Lower Chetco River, Oregon: Open-File Report 2009-1163 by Rose J. Wallick, United U. S. Department of the Interior, Et Al - Paperback

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69.30 درهم 

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رقم ال ISBN
9781288709878
الفئات
سياسة
الكاتب
Rose J. Wallick, United U. S. Department of the Interior, Et Al
الناشر
Bibliogov
الوصف:

The lower Chetco River is a wandering gravel-bed river flanked by abundant and large gravel bars formed of coarse bed-material sediment. The large gravel bars have been a source of commercial aggregate since the early twentieth century for which ongoing permitting and aquatic habitat concerns have motivated this assessment of historical channel change and sediment transport rates. Analysis ...

تشحن من الولايات المتحدة
اشحن الى دبي (تغيير المدينة)
التوصيل خلال السبت ٤ أغسطس - الأحد ٥ أغسطس الي دبي

حالة السلعة:
جديدة
البائع:
InternationalBookStore (87% تقييم ايجابي)

معلومات المنتج

  •  

    المواصفات

    رقم ال ISBN
    9781288709878
    الفئات
    سياسة
    الرقم المميز للسلعة
    2724354426870
    المؤلفين
    الكاتب
    Rose J. Wallick, United U. S. Department of the Interior, Et Al
    المؤلفين
    الناشر
    Bibliogov
    رقم ال ISBN
    9781288709878
    الفئات
    سياسة
    الرقم المميز للسلعة
    2724354426870
    المؤلفين
    الكاتب
    Rose J. Wallick, United U. S. Department of the Interior, Et Al
    المؤلفين
    الناشر
    Bibliogov
    معلومات تقنية
    غلاف الكتاب
    غلاف عادي
    اللغات والبلدان
    لغة الكتاب
    الانجليزية
    إقرأ المزيد
  •  

    الوصف:

    The lower Chetco River is a wandering gravel-bed river flanked by abundant and large gravel bars formed of coarse bed-material sediment. The large gravel bars have been a source of commercial aggregate since the early twentieth century for which ongoing permitting and aquatic habitat concerns have

    The lower Chetco River is a wandering gravel-bed river flanked by abundant and large gravel bars formed of coarse bed-material sediment. The large gravel bars have been a source of commercial aggregate since the early twentieth century for which ongoing permitting and aquatic habitat concerns have motivated this assessment of historical channel change and sediment transport rates. Analysis of historical channel change and bed-material transport rates for the lower 18 kilometers show that the upper reaches of the study area are primarily transport zones, with bar positions fixed by valley geometry and active bars mainly providing transient storage of bed material. Downstream reaches, especially near the confluence of the North Fork Chetco River, have been zones of active sedimentation and channel migration. Multiple analyses, supported by direct measurements of bedload during winter 2008-09, indicate that since 1970 the mean annual flux of bed material into the study reach has been about 40,000-100,000 cubic meters per year. Downstream tributary input of bed-material sediment, probably averaging 5-30 percent of the influx coming into the study reach from upstream, is approximately balanced by bed-material attrition by abrasion. Probably very little bed material leaves the lower river under natural conditions, with most of the net influx historically accumulating in wider and more dynamic reaches, especially near the North Fork Chetco River confluence, 8 kilometers upstream from the Pacific Ocean. The year-to-year flux, however, varies tremendously. Some years probably have less than 3,000 cubic meters of bed-material entering the study area; by contrast, some high-flow years, such as 1982 and 1997, likely have more than 150,000 cubic meters entering the reach. For comparison, the estimated annual volume of gravel extracted from the lower Chetco River for commercial aggregate during 2000-2008 has ranged from 32,000 to 90,000 cubic meters and averaged about 59,000 cub.

    خصائص المنتج:
    • الفئات: سياسة
    • غلاف الكتاب: غلاف عادي
    • لغة الكتاب: الانجليزية
    • الكاتب: Rose J. Wallick, United U. S. Department of the Interior, Et Al
    • الناشر: Bibliogov
    • رقم ال ISBN: 9781288709878
    • عدد الصفحات: 96
    • لأبعاد (الارتفاع*العرض*العمق): 9.69 x 7.44 x 0.2 inches
 

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