A Comparison Study of Bioengineering Streambank Types

• Main Authors: Wen-Ling Yang, 楊文玲
• Other Authors: Su -Hsin Lee
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/47250974710614122928

碩士 === 逢甲大學 === 建築所 === 97 === Abstract Taiwan’s stream remediation projects emphasize on engineering safety, construction efficiency and conveniences, but less consideration on overall environmental issue, thus stream revetment design is a commonly used by concrete and monotonous. This design generates resource wastage, and also caused a significant impact on natural ecology. Therefore, based on location-based applicability principles of eco-engineering stream revetment models, this study has taken 14 types of revetment constructions that are commonly used in projects and of which are capable of providing economic, safety, ecological and aesthetics effects to made a survey on their applicability with the help of integrated accomplishments and experiences from professionals. An evaluation form has been established to assist practitioners in deciding upon the location-based revetment projects. The study has come out with the following conclusions: During the first-step analytic hierarchy process, the study had analyzed, studied and summarized some of the relevant literature, and interviewed, brainstorm discussed and sorted out the evaluate elements of eco-engineering stream revetment models. They were grouped into four strategic levels and 12 influential factors of evaluation criteria to establish an evaluation structure using an interpretive structureal modeling(ISM), and utilized the analytic hierarchy process to carry out weight analyze of the relative importance of each factor. Through the questionnaire survey, the study has revealed that the four priorities of strategic levels come in order of “safety,” “ecological,” “economic” and “aesthetics.” Meanwhile, the priorities of five of the 12 influential factors in order are “structural stability,” “security to the surrounding environment,” “the strength of revetment,” biological diversity” and “minimize structural project design. Despite some variances in opinions among some of the professionals, but the overall variances are relatively small to indicate that the views of experts have a certain degree of consistency. For the second-step engineering applicability analysis, the study has discovered that the top three highest scores in order among the overall revetment types are pitched stone revetment, grouted stone revetment, and concrete frame stone infill and vegetated revetment. Generally, the pitched stone revetment has won the highest score due to its benefits to economic, safety, ecological and aesthetics aspects. Therefore, it is advisable to employ pitched stone revetment as the foundation, and then to design other improved pitched stone revetment types. Overall, the lowest scores in order go to blanket revetment, stake and infill roll revetment, and stacked cellular confinement revetment. In regard to effectiveness aspect, it is suggested to adopt the following eco-engineering revetments in order to comply with location-based applicability: 1. For revetment models with higher economic requirement aspect, it is recommended to use pitched stone revetment engineering method, riprap revetment, and grouted stone revetment. 2. For revetment models with higher safety requirement aspect, it is recommended to use grouted stone revetment, concrete frame stone infill and vegetated revetment, and concrete rib revetment. 3. For revetment models with higher ecology requirement aspect, it is recommended to use piling and wattle revetment, piled raft revetment, and pitched stone revetment. 4. For revetment models with higher aesthetics requirement aspect, recommendation to use piling and wattle revetment, pitched stone revetment, and piled raft revetment. On the other hand, pitched stone revetment has also shown a higher degree of acceptance from non-professional domain, indicating that it coincides with the results of overall evaluation. Finally, the study has constructed an eco-engineering revetment model appraisal sheet to provide practitioners the capability of evaluating the appropriate construction designs under different environment and functional requirements. This aims to assist practitioners to decide upon the types of location-based revetment constructions, thereby achieving an effective use of resources or serving as a reference for the research and development of new construction methods.