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| 題 名 | 林道闢建所可能產生的泥砂量﹣﹣多納林道的一個個案調查 |
|---|---|
| 作 者 | 夏禹九; | 書刊名 | 林業試驗所研究報告季刊 |
| 卷 期 | 5:3 1990.09[民79.09] |
| 頁 次 | 頁165-174 |
| 分類號 | 436.61 |
| 關鍵詞 | 多納林道; 林道; 泥砂量; 產生; 闢建所; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 林試所六龜分所20及22林班內的4段林道經由斷面調查估計其可能 產生的土石方量分別為:1.主林道,365m^3/100m;2.伐區支線, 396m^3/100m; 3.森林區支線,4683m^3/100m;4.集材便道,98m^3/100m。造成森林區支線過多 的土石方量的原因是其在陡峻的單一坡面上為了載重的卡車能夠爬昇,而開闢了 林道坡度僅約1.1度的林道,因此產生過多的迴頭彎與大量的挖方。此一林道應 予以封閉以免產生更多的泥砂災害。由20林班通往22林班一個伐區的支線在溪 谷中沿溪填築了135m,造成直接的溪流泥砂來源,林道的闢建對溪流的影響是 極為顯著,應當儘量避免。伐區集材便道通常在封閉後4、5年內即可鬱閉,而 在這裸露的期間,應該儘量減少林道的長度,伐區的形狀如能配合地形而成為長 軸與等高線平行的長方形,應可減少迴頭彎的發生。 |
| 英文摘要 | Four sections of logging road in the Liu-Kwei experimental forest were surveyed. The volume of soil excavated was estimated by measurement of the slope profile along the cross section of ther road every 20 meters. Soil excavated were 365 m^3/100m, 396 m^3/100m, 4683 m^3/100m, and 98 m^3/100m for the main logging road, secondary logging road passing cutover area, secondary logging road passing intact forest area, and temporary logging road in a clearcut area, respectively. The extraordinary amount of excavation along the secondary logging road passing the intact forest area was caused by a very low road gradient (averages only 1.1°). The design of such a low gradient was necessary for uphill climbing of heavily loaded trucks. The enormous amount of soil spilled along the road plus the road leading directly to the valley bottom is obviously a major source of sediment in the stream. It is recommended that this road should be closed as soon as possible to reduce further damage to the stream. A 135 meter long road constructed in the stream bed was another major mischief of the road design and should be avoid in the future. Road surface can be fully vegetated within 4 to 5 years following the close of the road in Liu-Kwei area. Temporary logging road, generally, shows no sign of further soil erosion problems. However, longitudinal alignment of the clearcut unit along contours should be imposed in ther future operations to reduce the area exposed by logging road surface. |
本系統中英文摘要資訊取自各篇刊載內容。