Environmental, Hydrologic Characteristics of and Integrated Conservation Strategies for Shuili Creek Watershed in Central Taiwan
| Autor: | Hui-Lan Hu, 胡慧蘭 |
|---|---|
| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 The objective of this study was to explore the environmental, hydrologic and social-economic characteristics for sustainable development in the Shuili Creek watershed, Nantou County. Land uses suitable for sustainable development are proposed and delineated. Strategies and measures for proper watershed conservation and management are also suggested. The area of Shuili Creek watershed is 8900 ha. The annual average temperature is 20.22℃ and the air humidity is 83.75%. Forests account for 55.5% of total land area of this watershed. Other land uses include betel nuts （19%）and agriculture（8%）. Average elevation of Shuili Creek watershed is 394 m, and average slope is 20%. The main soil type of Shuili Creek is lithosol and its major geology type is Szu-Leng sandstone. Average annual rainfall is 2360 mm. Taking Lien Hwa Chi＃3, ＃4, ＃5 sub-watersheds of the Taiwan Forestry Research Institute as examples, annual flow ratios are 43.7％, 55.3％, and 41.8％ respectively. Among these watersheds, the ＃4 sub-watershed has higher flow ratio because it has lower evapotranspiration that resulted from clear cutting in 1982. Stormflows usually occur in the July to October typhoon season. In the Shuili Creek watershed, good forest covers have the following favorable hydrologic functions: (1) protecting slopeland against erosion, (2) tree-crown interception and evapotranspiration help reduce landslide occurrence by reducing chance to saturate slopeland soil. The high infiltration capabilities of forest soils reduce the possibilities of overland flow and minimizes high peak flow magnitudes. Three gauged sub-watersheds in the Shuili Creek watershed with different proportions of betel nuts, Houpeikenchi(19%), Jaulonchiand(13%) Herkenchi(5%) have average annual flow rates of 58.8%, 58.2%, 55.4% respectively. These are generally higher than flow rates from those 100% forested watersheds, possibly due to differences in evapotranspiration amounts. In the study watershed, seven land use zones are proposed with strategies for sustainable developmant. These 7 land use zones are (1) the Lien Hwa Chi experimental watershed ecology zone, (2) zone for leisure farms, (3) the riparian zone along the shuili creek, (4) the Sun Moon Lake scenic recreation zone, (5) the ecological zone around the Che-Chung village, (6) the hydro-power education zone, (7) the zone for conservation enhancement. For the goals of sustainable development, conservation strategies should be developed and implemented in each zone. For achieving these goals, the understanding, support, and participation of the local people is essential. Therefore, a community-oriented watershed advisory committee should be set up to help implement various strategies. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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