A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Long Term Bed Degradation in Maryland Streams (Phase 2): Blue Ridge and Western Piedmont Provinces
Estimation of potential long-term down-cutting of the stream bed is necessary for evaluation and design of bridges for scour and culverts for fish passage. The purpose of this study has been to improve predictions of this potential long-term bed degradation (LTBD) in Maryland streams through the measurement and analysis of stream bed and waterway structure survey data and bridge plans. Long-term bed degradation was defined as the vertical change in the channel profile other than that caused by local or contraction scour. A total of 30 sites--30 bridges, 2 culverts, 2 utility crossings, 2 embankment walls, and 1 concrete ford--in Frederick, Carroll, and Montogomery counties were selected for data collection. Drainage areas of these sites in the Blue Ridge and Piedmont physiographic provinces ranged from 1.7-25.9 miles. At each sampling site, the vertical drop at the outlet of the structure was measured with a pocket rod and a hand level. These rapid measurements were conducted where a step, a series of steps, a steep section, or a riprap-protected streambed was at the outlet of a culvert or a bridge with a paved or riprap-protected invert or down-stream apron.
Long Term Bed Degradation in Maryland Streams (Phase 2): Blue Ridge and Western Piedmont Provinces
Estimation of potential long-term down-cutting of the stream bed is necessary for evaluation and design of bridges for scour and culverts for fish passage. The purpose of this study has been to improve predictions of this potential long-term bed degradation (LTBD) in Maryland streams through the measurement and analysis of stream bed and waterway structure survey data and bridge plans. Long-term bed degradation was defined as the vertical change in the channel profile other than that caused by local or contraction scour. A total of 30 sites--30 bridges, 2 culverts, 2 utility crossings, 2 embankment walls, and 1 concrete ford--in Frederick, Carroll, and Montogomery counties were selected for data collection. Drainage areas of these sites in the Blue Ridge and Piedmont physiographic provinces ranged from 1.7-25.9 miles. At each sampling site, the vertical drop at the outlet of the structure was measured with a pocket rod and a hand level. These rapid measurements were conducted where a step, a series of steps, a steep section, or a riprap-protected streambed was at the outlet of a culvert or a bridge with a paved or riprap-protected invert or down-stream apron.
Long Term Bed Degradation in Maryland Streams (Phase 2): Blue Ridge and Western Piedmont Provinces
A. C. Parola (author) / W. L. Oberholtzer (author) / D. W. Black (author)
2012
38 pages
Report
No indication
English
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