圖書典藏及影音數位平台

蓮海岸北起和平溪口南至秀姑巒溪口旁之三富溪口，全長118公里，其範圍位於颱風侵襲頻繁路徑地區，依照地理環境約可分為3段，第一段為和平溪口至立霧溪口；第二段為立霧溪口至花蓮溪口；第三段為花蓮溪口至秀姑巒溪口；在國土保護原則下，本局陸續興建離岸潛堤、導流堤及突堤等海岸防護措施，以確保海岸防減災功能及沿岸居民之生命財產安全。為瞭解各區域防護設施之功效及監控海岸灘線之變化趨勢。 本局自75年開始辦理「南北濱及化仁海岸監測調查計畫」，並持續至90年，自91年始因應各海岸段之資料蒐集，陸續增加新城鄉七星潭海岸、94年壽豐鄉水璉海岸、95年壽豐鄉牛山海岸、96年東興至豐濱海岸、98年環保公園海岸、102年崇德與新城海岸、105年鹽寮海岸監測等海岸監測作業等，總計106~107年度監測海岸長度約40餘公里，30餘年監測所得相關資料逐年納入資料庫建置與分析比對，提供日後海岸防護規劃及對策研擬參考依據。

Hualien coast located in the Taiwan eastern and attack by typhoon frequently. In order to understand effectiveness of protective equipment in each region and to monitor shoreline change; The 9th River Management Office of water Resources Agency, Ministry of Economic Affair has been doing coastal change monitor observation program along the Hualien coast since 1986. Qixingtan Coast in 2002, Ciwidian Coast in 2005, Niushan Coast in 2006, Dongxing to Fongbin Coast in 2007, Environmental Park in 2009, Zonta to Sinchen Coast in 2013, Novosti Coast in 2014 and Fengbin in 2015 are added to the monitoring range ; with the approach of database built and integration, the result can be applied to coastal changing research,embankment rehabilitation, as well as coastal protection countermeasure. According to Survey and monitoring for the Hualien Coast in 2018, the result：(1) Zonta to Sinchen Coast (approximately 17.5km), from Zonta to Sinchen shoreline shrank in average rate of ?0.957 m/year compared with 2013 year data. (2) Qixingtan to Royalton Coast (approximately 6 km), Qixingtan shoreline shrank in average rate of －3.24 m/year compared with 2013 year data ; However Royalton shoreline few growth cause of flow field from north coast in average rate of +1.08 m/year thus stacked gabion walls at toe increase shoreline stable. (3) Bebin, Nanbin and Huaren Coast (approximately 4 km), in Jinghua District, Hualien City, Coastal flow field and coastal sediment circulation system changed caused Meilun River estuary deposited and the south of Bebin shoreline shrank severely since Hualien east and west port breakwater construction completed in 1987, shoreline shrank in average rate of ?0.23 m/year, before offshore breakwaters construction completed in 1996 shoreline shrank in average rate of +1.89 m/year. (4) Ciwidian to Niushan Coast (approximately 2 km), Ciwidian shoreline shrank in average rate of ?1.42 m/year compared with 2013 year data, and Niushan shoreline shrank in average rate of ?6.21 m/year. The overall trend show land side shrank back and Niushan shoreline shrank rate faster than Ciwidian coast. (5) Yanliao (approximately 1 km), Yanliao shoreline shrank in average rate of +2.12 m/year. (6) Novosti to Fongbin (approximately 9 km), Novosti shoreline shrank in average rate of －1.85 m/year, and Fongbin shoreline shrank in average rate of ?1.52 m/year compared with 2013 year data, the whole shoreline growth toward.