徐春田2006-08-232018-06-282006-08-232018-06-282002http://ntur.lib.ntu.edu.tw//handle/246246/29332將所開發之海底熱探針經由海上現場資料 的測試後發現其解析度可達萬分之一度﹙0.1m ℃﹚，這一驚人的結果實際上比文獻上所引述的千 分之一度足足提高了十倍。目前量測海床的熱流 值，大多採用利氏 ﹙Lister- type﹚海底熱探針， 此法的好處是可同時測得當時當地的海床溫度及 沉積物的導熱係數，然而由於粗重之探針插入海床 時會磨擦生熱，理論上要等待很久的時間﹙數日﹚ 才能量測到原來未受干擾時的穩定溫度，因此我們 提出了一種資料處理的方法，利用短時間﹙數分鐘﹚ 受磨擦上升的溫度記錄去推求長時間的溫度變 化，基本原理是以圓形針受熱後的溫度衰減函數 ﹙Carslaw and Jaeger, 1959﹚對原來未受干擾之 穩定溫度、磨擦上升之溫度、熱導係數及沉積物密 度與比熱之乘積等參數做回歸求解，我們發現雖然 所求得的參數除沉積物之穩定溫度外，其餘參數之 解均不甚準確，但卻可以準確的推估受磨擦後長時 間之溫度變化及沉積物最終之穩定溫度，經由數值 模擬及海上高解析度現場資料的配合亦可準確的 ﹙±0.1m℃﹚推算出海底沉積物的穩定溫度。我們 將此一方法配合所設計的海底熱探針，建立了一套 熱流資料的處理步驟，並將此一處理方法應用於過 去數年來在南沖海槽所收集到的地熱資料，繪製成 熱流等值線圖並標示出熱流的極高與極低的異常 區。During field-testing, we found the data resolution of the marine heat probe developed by us could reach the stunning 0.1m℃, which is much better then the 1m℃ resolution indicated in the related scientific literature. Today’s heat flow data are mostly produced by Lister-type marine heat probe. The advantage of this method is the capability of measuring both temperature and thermal conductivity of ocean floor sediments in situ. However, due to the friction heat produced during the probe insertion process, it is required to wait infinitely (often days) until the temperature returning to its original undisturbed state. Due to the much higher data resolution produced by our new heat probe, we have developed an improved data processing technique. That is to utilize the short-term (12 minutes) recordings of the temperatures raised by frictional heat to predict the temperatures in the long term. The principle is to regress the temperature decay function of a heated cylindrical (Carslaw and Jaeger, 1959) with respect to variables of the original undisturbed temperature, temperature raised by frictional heat, thermal conductivity, and product of density and specific heat of the sediments. We found all the variables are not quite accurate except the undisturbed temperature of the sediments. But we are able to accurately predict the long-term temperature changes caused by frictional heat and the final undisturbed temperature of the sediments. Through the numerical and field test we have found that the undisturbed temperature can be accurately calculated (±0.1m℃). In order to incorporate the data processing method to the high-resolution heat probe data, we therefore established a heat flow data processing routine. We applied the process on the data collected from southwestern Okinawa Trough and compiled an iso-heat flow chart, which also indicates the abnormal high and low heat flow zones.application/pdf510539 bytesapplication/pdfzh-TW國立臺灣大學海洋研究所高解析度熱探針資料處理沖繩海槽西南端熱流High Resolution Heat ProbeData ProcessingSouthwestern Okinawa TroughHeat Flow[SDGs]SDG14reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/29332/1/902611M002022ODP.pdf