本文選題：航空瞬變電磁 + 正演�。� 參考：《成都理工大學》2015年碩士論文

【摘要】：我國疆域遼闊,地大物博,擁有豐富的資源,但是這些資源大多位于沼澤、沙漠、山地等地形復雜區(qū)域。這些區(qū)域環(huán)境惡劣,給地面電磁法勘探帶來了很大的困難。即使在地形較為平坦的地區(qū)進行勘探,地面電磁法的效率也較低,很難實現(xiàn)大面積勘探。自從20世紀50年代,航空電磁法獲得應用開始,幾十年來已經(jīng)在礦產(chǎn)資源勘查、地下水調查、地質填圖等領域獲得了廣泛的應用。由于航空電磁法的工作方式為空中激發(fā)且空中接收,以及其具有較低成本、勘探效率高、可大面積勘探等特點,使得該方法可以克服地面電磁法在復雜地形區(qū)域難以施工的困難。和頻率域航空電磁法相比,時間域航空電磁法具有較大的勘探深度以及較好的橫向分辨率,所以時間域航空電磁法已經(jīng)稱為復雜地形區(qū)域勘查的有效工具之一。本文在國家863重大項目“航空地球物理勘查技術與裝備”的課題“直升機吊艙式時間域航空電磁勘查系統(tǒng)實用化研究”和地調項目“航空電磁數(shù)據(jù)處理研究”的支持下,對一維航空瞬變電磁正反演及其并行計算方法進行了研究和分析。具體來說,本文研究內容主要包括以下幾個方面:(1)本文從麥克斯韋方程組出發(fā),推導了層狀半空間中心回線的正演響應計算公式,并編程實現(xiàn)了一維正演模擬方法。在一維正演方法中,對頻時轉換問題做了深入分析并對正、余弦變換和G-S變換這三種頻時轉換對正演響應的影響進行詳細的討論。(2)本文應用阻尼最小二乘法實現(xiàn)了對航空瞬變電磁數(shù)據(jù)的反演。對反演過程中的阻尼因子選擇、雅克比矩陣計算和質量控制指標的設定做了一定的分析,并討論了典型三層和四層地電模型的反演結果。(3)本文實現(xiàn)了基于MPI(Message Passing Interface)的航空瞬變電磁一維正演和反演方法。首先驗證了并行計算的正確性,接著對比了串行和并行計算的耗時問題,最后討論了不同的多核CPU和不同的進程數(shù)情況下并行計算的加速比和并行效率問題。
[Abstract]:Our country has vast territory, abundant land and abundant resources, but most of these resources are located in complex terrain areas such as swamp, desert, mountain and so on. The environment of these areas is very bad, which brings great difficulties to surface electromagnetic exploration. Even if the terrain is flat, the efficiency of surface electromagnetic method is low, so it is difficult to realize large-scale exploration. Since the application of aero-electromagnetic method in 1950s, it has been widely used in the fields of mineral resources exploration, groundwater survey, geological mapping and so on. Because the work mode of aero-electromagnetic method is aerial excitation and aerial receiving, and it has the characteristics of low cost, high exploration efficiency and large area exploration, etc. This method can overcome the difficulty of surface electromagnetic method in complex terrain area. Compared with frequency-domain aero-electromagnetic method, time-domain aero-electromagnetic method has higher exploration depth and better lateral resolution, so time-domain aero-electromagnetic method has become one of the effective tools for the exploration of complex terrain areas. This paper is supported by the project of "Aeronautical Geophysical Prospecting Technology and equipment", "practical Research on Aero-electromagnetic Prospecting system in time Domain of helicopter Pool" and "Research on Aeronautical electromagnetic data processing", which is a major project of national 863 project. In this paper, one-dimensional aeronautical transient electromagnetic forward and inverse modeling and its parallel calculation method are studied and analyzed. Specifically, this paper mainly includes the following aspects: 1) in this paper, the forward response formula of the central loop in layered half-space is derived from Maxwell's equations, and the one-dimensional forward modeling method is realized by programming. In the one-dimensional forward modeling method, the frequency-time conversion problem is deeply analyzed and positive. The effects of cosine transform and G-S transform on forward response are discussed in detail. The selection of damping factor in the inversion process, the calculation of Jacobian matrix and the setting of quality control index are analyzed. The inversion results of typical three-layer and four-layer geoelectric models are discussed. In this paper, the one-dimensional forward modeling and inversion method of aeronautical transient electromagnetism based on MPI(Message Passing interface are realized. First, the correctness of parallel computing is verified, then the time consuming problems of serial and parallel computing are compared. Finally, the speedup and parallel efficiency of parallel computing under different multi-core CPU and different number of processes are discussed.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P631.326

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本文編號：1956277