Assessing Wooden Material Application in Ecological Engineering Methods in Taiwan

木質材料應用於臺灣地區生態工法之監測與效益評估

Chiang Wei ； Far-Ching Lin ； Chin-Ling Lee ； Yu-San Tseng ； Yi-Jru Chien

《Journal of Ecotechnology》 4卷1期 (2008/06) Pp. 20-42

https://doi.org/10.29769/JE.200806.0005

摘要

臺灣中部近年分別於1999年遭受九二一集集大地震、2001年桃芝颱風及納莉颱風引發之土石流侵襲，有關單位耗費相當之資源進行復建工程。部份復建工程採用『因地制宜、就地取材』如砌石護岸、蛇籠、格柵式擋土牆等生態工法進行，其中部份以木質生態材料進行之復建工程，亦已經通過2004年敏督利颱風之考驗。然而在臺灣有關利用木質材料進行之生態工法案例，仍少有研究針對其工法之設計、後續監測與評估進行較深入之探討。本研究針對行政院農委會年林務局、水土保持局及臺大實驗林管理處於災後於宜蘭與南投縣所興建之生態工法木質結構物進行分析。其中包括木質結構物後續之變位、腐朽程度及結構強度及其完成後植生覆蓋之效益進行分析。經過2006年三月至2007年六月為期一年多之監測，初步結果顯示木質結構物歷經後續之颱風豪雨侵襲，其結構監測點之變位仍屬輕微；木質之腐朽強度及結構強度仍維持良好之狀態。而取代傳統硬式混凝土工法之木質材料之生態工法，於完工之後更利於植生之被覆與復育。除讓工程結構物更融入週遭環境，研究中亦針對被覆之植生進行定量之現地調查分析，其結果亦顯示對植生復育具有正面之效益，同時相較於混凝土材質，使用木質材料之結構物亦可有效降低二氧化碳之排放。本研究結果可提供未來利用木質材料進行生態工法設計時之重要參考。

關鍵字

木質材料 ； 生態工法 ； 監測與評估 ； 碳吸存

並列摘要

The Central Taiwan region suffered severe damage caused by debris flow during the disastrous Chi-Chi Earthquake in 1999, Typhoon Toraji and Nali in 2001. Rehabilitation work was undergoing by the authorities who invested a great deal of money and resources. Part of the work adopted the ecological engineering techniques to reconstruct the facilities such as the articulated blocks bank, gabion and geogrid walls by the ”local material was utilized first” principle to reduce the usage of concrete. Some of these facilities based on the design of ecological techniques, which was made of wooden material, had passed the test of Typhoon Mindulle in July of 2004. However, few studies were focused on the design, monitoring and assessment of the wooden material applied on ecological works in Taiwan. This study analyzes some ecological works made of wooden material by the Forest Bureau, the Soil and Water Conservation Bureau and National Taiwan University Experimental Forest where these works are located in Yilan and Nantou County respectively. The displacement, strength, rottenness and water content of wooden structure, along with the recovery benefits were monitored and assessed in this study. The preliminary results show that the displacement and rottenness of wooden material works is minor and the safety is quite well subject to the subsequent typhoons and large rainfall events between 2006 and 2007. Besides, the vegetation spreads well over the works and merges with the environment after the wooden material works are finished and the abundance is also investigated to stand for the recovery effect of these works. Further, by comparing wooden ecological works with concrete ones, the former can obviously decrease the amount of carbon dioxide emission and increase sequestration of carbon in the material. The result provides a key reference to set the design regulations and rules in the future.

並列關鍵字

wooden material ； ecological engineering techniques ； assessment and monitoring ； carbon sequestration