碩士 / 國立臺東大學 / 資訊管理學系碩士班 / 97 / The Study of Intervention Strategy for the River Bed Dust Storm in the Mouth of Bai-nan Stream
Chou Yuan-Chun
Abstract
The estuary of Pei-Nan Stream is located in the northeast of Taitung City, facing eastward toward Fu-Kung Village, westward toward downtown Taitung, southward toward the Pacific Ocean, and northward toward the Taitung Coast Mountains. The stream courses through Taiwan Central Mountains in Hai-Duan Town and then runs along the Taitung Coast Mountains all the way to Li-Chi Fault Zone in Pei-Nan Town. Li-Chi Fault Zone, which is composed of soft, easily eroded shales, has suffered a sever degree of soil loss. With its river bed filled with great amount of sand, gravels, and fine dust, the fault zone has become one of the hot spots of dust storms at the estuary of Pei-Nan Stream. Taitung City, the center of the sixteen villages and towns in Taitung County in terms of geography, population, politics, economics, and culture, is situated in the southwest of Pei-Nan Stream, and has been well-known as “The Sand City”. Every year during fall and winter time, or even right before the arrival of a typhoon, strong northeastern monsoon gales will bring about serious dust storms at the estuary of Pei-Nan Stream. With great amount of dust floating and circulating in the air, downtown Taitung is engulfed in thick layers of dust. The low outdoor visibility and inferior air quality are great endangerments to the residents’ traffic safety, living quality and inconvenience when engaging in agricultural, industrial, and business activities. In order to solve dust storm-related problems, authorities concerned have spent considerable government budgets implementing all sorts of mitigation and prevention engineering such as river bed vegetation restoration, watershed restoration, automatic sprinkler systems, biochemical cementation of sandy river bed soils, or installation of straw sand barrier, but of little or no avail. Every year, dust storms arising from the estuary of Pei-Nan Stream remain to torment the residents of Taitung City.
In this study, a probe into those approaches seeking to explain the ineffectiveness reveals that lack of dust storm monitoring, lack of study on mechanisms of dust rising, and lack of analysis and assessments on the intervention engineering over the years are held responsible. This study proposes a set of mitigation and intervention strategies by integrating the data gathered and analyzed from (1) temporal and spatial data on climate, hydrology, landscape and sandy river bed soils collected and cross-examined by in-site inspection conducted from the estuary of downstream of Pei-Nan Stream to downtown Taitung , (2) analysis on the dust storm mitigation and intervention strategies conducted in Taiwan and abroad, and (3) effect assessments of the intervention engineering approaches over the years. The results show that the dust storms originating from the estuary of Pei-Nan Stream are categorized as airborne particulate hazards. Proposed intervention strategies seek to directly deal with the very origin of the dust storm to achieve effective dust storm interventions: (1) improving river bed stabilization and vegetation restoration, (2) building a shelterbelt (windbreak zone) more than 70 meters along the banks of the estuary of Pei-Nan Stream by means of urban or non-urban design projects, (3) planting windbreak trees on a massive scale so that wind flows blowing through the estuary of Pei-Nan Stream can be modified and the erosion of the river bed can be reduced, (4) upgrading the automatic sprinkling systems at the mouth of the stream to help keep the river bed stay moist, and finally (5) restoring and maintaining river bed vegetation to resist drought and reduce wind speed and wind erosion.
Key Words： Pei-Nan Stream; Li-Chi Fault Zone; River Bed; Dust Storm
| Identifer | oai:union.ndltd.org:TW/097NTTTC396010 |
| Date | January 2009 |
| Creators | CHOU YUAN-CHUN, 周元春 |
| Contributors | WANG, 王文清 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 89 |
Page generated in 0.0022 seconds