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IMPACT OF STREAM DEGRADATION ON BRIDGES AND RURAL TRAVEL PATTERNS.
| 题名： | IMPACT OF STREAM DEGRADATION ON BRIDGES AND RURAL TRAVEL PATTERNS. |
| 作者： | Yang-X; McVey-MJ; Morris-LL; Baumel-CP |
| 关键词： | STREAM-CHANNELS; DEGRADATION-; RURAL-ROADS; BRIDGES-; DAMAGES-; IOWA-; BENEFIT-COST-ANALYSIS; BRIDGE-RECONSTRUCTION; BRIDGE-MAINTENANCE; ABANDONMENT-; FUND-ALLOCATIONS; MATHEMATICAL-MODELS; BUDGETING-; CONSTRAINTS- |
| 摘要： | Stream degradation has resulted in significant damage to rural roads and bridges in several areas of the United States. Western Iowa is one region that has been severely affected. In the beginning of the 20th century, many streams throughout Iowa were channelized to reduce flooding and to open more land to farming. Channel straightening accomplished its goal, but led to greater stream flow velocities, causing degradation on stream channels. This widening and deepening of streams resulted in damage to rural roads and bridges. This study evaluates the effects of stream degradation on county bridges and rural travel patterns in western Iowa. A conceptual model for measuring the benefits and costs of reconstructing, maintaining, or closing county bridges is presented, and a budget constraint model is constructed to show how limited funds might be distributed among various bridge projects. This model will be compared with the benefit-cost analysis based on net benefits and the benefit-cost ratio method of allocating funds. |
| 总页数： | Transportation Research Record. 1995. (1498) pp82-91 (5 Tab., 18 Ref.) |
| 报告类型： | 科技报告 |
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