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頁籤選單縮合
題名 | 利用魚探器輔助人工魚礁精確定位可行性之研究 |
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作者 | 吳世宏; 謝日豐; 王敏昌; | 書刊名 | 水產研究 |
卷期 | 1:2 1993.12[民82.12] |
頁次 | 頁1-11 |
分類號 | 439.3 |
關鍵詞 | 魚探器; 底浮標; 標物反射強度; Echo sounder; Bottom buoy; Target strength; |
語文 | 中文(Chinese) |
中文摘要 | 為研究由魚探器來輔助人工魚礁精確定位,於民國78年 3月至12月 間在望海巷人工魚礁區,利用直徑分別為14、18、30 cm之拖網用合成浮球, 組合成底浮標,投放於人工魚礁附近,再以安裝於竹筏舷側之魚探器(HE-301 型),加以探測及解析,並獲得如下之結果:一、拖網用浮球愈大,則其標物反 射強度愈大並且愈接近理想化全反射球體之理論計算值;二、魚探器對底浮標 之水平探知能力可精確到10?20 m範圍內,亦即對人工魚礁之定位而言,是目 前可應用的簡便方法中較為精確者。而且不管任何廠牌或型號之魚探器,只要 性能正常,對底浮標之垂直探知能力均有效;三、本次試驗設計之底浮標,半 年來經過兩次颱風吹襲之惡劣天氣下,仍安然無恙地存在,顯示抓著力非常強 勁;唯尼龍繩容易斷裂無法持久地繫留住底浮標,而鐵鍊則無是項缺失。 |
英文摘要 | A study was made to locate artificial reef accurately using the echo sounder. The bottom buoy unit grouped polyethylene floators with 14, 18 and 30 cm in diameter, and was shot around the artificial reef area off the shore in Keelung. Sounding experiments were executed using an echo sounder (type: HE- 301) from March to December, 1989. This study obtained the following conclusions: The bigger the floator of bottom bouy was, the stronger and closer to the theoretical value of idealized perfectly reflecting sphere its target strength was; The bottom buoy unit was able to be detected clearly by any normal echo sounder used in current. Furthmore, it was an accurate and simple method for locating artifical reef; Concrete anchors were used to provide enough holding power for maintaining the bottom buoy unit on station. However, nylon rope used for mooring lines was more easily broken than chain in bad weather conditions. |
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