青島海灘表面磁性特征分析及其指示意義
發(fā)布時(shí)間：2019-04-23 18:22
【摘要】：海灘是大自然賦予人類的珍貴的自然資源，是海陸作用最活躍的地區(qū)，其宜人的景致能夠作為人們的休閑旅游場所而產(chǎn)生經(jīng)濟(jì)效益，其特殊的地理位置能夠阻隔海浪對(duì)陸地建筑、農(nóng)田和道路的沖擊，保護(hù)人類的生存空間。但目前海灘侵蝕是一個(gè)普遍存在的問題，海灘侵蝕是一個(gè)源到匯的過程，那掌握海灘沉積地貌特征、正確認(rèn)識(shí)海灘的沉積動(dòng)力環(huán)境和過程并予以科學(xué)的防護(hù)就顯得尤為重要。 沉積物磁性特征一般可通過磁性礦物的含量、種類和顆粒大小等因子來反映，而這些因子與沉積物源、搬運(yùn)遷移、沉積動(dòng)力作用以及沉積后次生變化等條件密切相關(guān)，因此沉積物的磁性特征蘊(yùn)含著豐富的環(huán)境信息。本文選擇青島前海著名海灘一浴海灘、二浴海灘和石老人海灘作為研究對(duì)象，通過對(duì)研究區(qū)海灘磁性特征、沉積物粒度特征和磁性礦物成分分析，結(jié)合該區(qū)水動(dòng)力條件，探討海灘沉積物磁性與粒度的關(guān)系，以及所反映的沉積指示意義和環(huán)境意義。 對(duì)一浴、二浴及石老人海灘表層沉積物進(jìn)行體積磁化率原地測量分析，發(fā)現(xiàn)海灘體積磁化率空間分布具有一定的規(guī)律性：在平行海岸方向上，高磁化率值出現(xiàn)在侵蝕區(qū)，相對(duì)低值出現(xiàn)在沉積區(qū)；在垂直海岸方向上，高磁化率值出現(xiàn)在灘肩頂附近的沖流帶區(qū)域，向海向陸兩個(gè)方向都減小，且在灘面區(qū)域磁化率值最小最穩(wěn)定。兩個(gè)由于受冬夏季季風(fēng)氣候影響，冬季西北向的風(fēng)將海灘表層低密度的細(xì)顆粒沉積物搬運(yùn)至海水中，密度高的重礦物（如磁性礦物）滯留原地，夏季則方向相反。所以冬季西北區(qū)出現(xiàn)小范圍磁化率高值區(qū)，而夏季東南區(qū)域出現(xiàn)小范圍磁化率高值區(qū)。而受自東向西向沿岸流的作用，海灘東側(cè)為侵蝕區(qū)，磁化率值較高；西部為沉積區(qū)域，磁化率值較低。 石老人海灘沉積物的粒度特征為：灘面下部沉積物粒度比灘面上部、灘肩區(qū)域更細(xì)。沉積物粒度從海灘西南區(qū)域向中間區(qū)域逐漸變小，再向東北區(qū)域又逐漸變大，分選性從西南區(qū)域向中間區(qū)域逐漸變好，而由中間區(qū)域向東北區(qū)域逐漸變差。整個(gè)海灘粒度變化大致呈帶狀分布。冬季海灘沉積物顆粒以中粗砂為主，沉積物顆粒分選中等，而夏季以中細(xì)砂為主，沉積物顆粒分選較好。不同粒級(jí)砂樣品的磁化率值有明顯差異，其中粒徑為0.063~0.125mm的細(xì)顆粒磁化率值遠(yuǎn)高于其他粒級(jí)（高1~2個(gè)數(shù)量級(jí)），這是由于控制海灘磁性的磁性礦物（如磁鐵礦）顆粒主要集中于粒徑為0.063~0.125mm的細(xì)顆粒中。 通過是石老人海灘磁性礦物的提取，顯微鏡下鑒定和電子探針分析發(fā)現(xiàn)，海灘磁性礦物主要為磁鐵礦，其次為鈦鐵礦，還有少量的赤鐵礦。
[Abstract]:The beach is the precious natural resource that nature endows mankind, is the most active land and sea function area, its pleasant scenery can be used as people's leisure tourism place and produces the economic benefit. Its special geographical location can prevent the impact of waves on land buildings, farmland and roads, and protect the living space of human beings. However, beach erosion is a common problem at present. Beach erosion is a process from source to sink. So it is very important to master the characteristics of beach sedimentary landform, correctly understand the dynamic environment and process of beach sedimentation and protect it scientifically. The magnetic characteristics of sediments are generally reflected by such factors as the content, species and particle size of magnetic minerals, which are closely related to the conditions of sediment source, transport and migration, sedimentary dynamics and post-deposition secondary changes. Therefore, the magnetic characteristics of sediments contain abundant environmental information. In this paper, one-bath beach, two-bath beach and Shigao beach are selected as the research objects in Qingdao Qianhai famous beach. Through the analysis of the magnetic characteristics, sediment size characteristics and magnetic mineral composition of the beach in the study area, combined with the hydrodynamic conditions in this area, The relationship between magnetic properties and grain size of beach sediments, as well as the sedimentary indication and environmental significance reflected in this paper are discussed. Through in situ measurement and analysis of the surface sediments in one bath, two bath and Shielderly beach, it is found that the spatial distribution of bulk susceptibility in the beach has certain regularity: in the direction of parallel coast, the high magnetic susceptibility value appears in the eroded area. The relatively low value appears in the sedimentary area; In the vertical coastal direction, the high magnetic susceptibility value appears in the alluvial zone near the top of the beach shoulder, and decreases in both directions towards the sea and land, and the lowest and most stable magnetic susceptibility value is found in the beach surface region. Due to the monsoon climate in winter and summer, the northwest wind in winter carries the low density fine grain sediment on the surface of the beach into the seawater, and the dense heavy minerals (such as magnetic minerals) stay in situ, but the direction is opposite in summer. Therefore, a small range of high value region of magnetic susceptibility appears in the northwest region in winter and a high value region of small range magnetic susceptibility in the southeast region in summer. However, due to the action of the coastal current from east to west, the east side of the beach is eroded, and the magnetic susceptibility is higher in the eastern part of the beach, while the magnetic susceptibility is lower in the western part of the beach. The grain size characteristics of the beach sediment in Shigao beach are as follows: the sediment size in the lower beach surface is smaller than that in the upper beach surface and the beach shoulder area is finer. The grain size of sediment gradually decreases from the southwest of the beach to the middle, and then to the northeast, and then to the northeast. The separability of the sediment becomes better from the southwest to the middle, and from the middle to the northeast. The grain size change of the whole beach is about zonal distribution. In winter, the beach sediment particles are mainly coarse sand, and the sediment particles are medium-sized, while in summer, the sediment particles are mainly medium-fine sand, and the sediment particles are better sorted. The magnetic susceptibility values of different grain size sand samples are obviously different, in which the magnetic susceptibility value of fine particles with 0.063~0.125mm particle size is much higher than that of other grain grades (1 ~ 2 orders of magnitude higher). This is due to the fact that the particles of magnetic minerals (such as magnetite) which control the beach magnetism are mainly concentrated in the fine particles with the size of 0.063~0.125mm. It is found that the beach magnetic minerals are mainly magnetite, followed by ilmenite and a small amount of hematite by extraction, identification under microscope and electron probe analysis.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P748
本文編號(hào)：2463692
[Abstract]:The beach is the precious natural resource that nature endows mankind, is the most active land and sea function area, its pleasant scenery can be used as people's leisure tourism place and produces the economic benefit. Its special geographical location can prevent the impact of waves on land buildings, farmland and roads, and protect the living space of human beings. However, beach erosion is a common problem at present. Beach erosion is a process from source to sink. So it is very important to master the characteristics of beach sedimentary landform, correctly understand the dynamic environment and process of beach sedimentation and protect it scientifically. The magnetic characteristics of sediments are generally reflected by such factors as the content, species and particle size of magnetic minerals, which are closely related to the conditions of sediment source, transport and migration, sedimentary dynamics and post-deposition secondary changes. Therefore, the magnetic characteristics of sediments contain abundant environmental information. In this paper, one-bath beach, two-bath beach and Shigao beach are selected as the research objects in Qingdao Qianhai famous beach. Through the analysis of the magnetic characteristics, sediment size characteristics and magnetic mineral composition of the beach in the study area, combined with the hydrodynamic conditions in this area, The relationship between magnetic properties and grain size of beach sediments, as well as the sedimentary indication and environmental significance reflected in this paper are discussed. Through in situ measurement and analysis of the surface sediments in one bath, two bath and Shielderly beach, it is found that the spatial distribution of bulk susceptibility in the beach has certain regularity: in the direction of parallel coast, the high magnetic susceptibility value appears in the eroded area. The relatively low value appears in the sedimentary area; In the vertical coastal direction, the high magnetic susceptibility value appears in the alluvial zone near the top of the beach shoulder, and decreases in both directions towards the sea and land, and the lowest and most stable magnetic susceptibility value is found in the beach surface region. Due to the monsoon climate in winter and summer, the northwest wind in winter carries the low density fine grain sediment on the surface of the beach into the seawater, and the dense heavy minerals (such as magnetic minerals) stay in situ, but the direction is opposite in summer. Therefore, a small range of high value region of magnetic susceptibility appears in the northwest region in winter and a high value region of small range magnetic susceptibility in the southeast region in summer. However, due to the action of the coastal current from east to west, the east side of the beach is eroded, and the magnetic susceptibility is higher in the eastern part of the beach, while the magnetic susceptibility is lower in the western part of the beach. The grain size characteristics of the beach sediment in Shigao beach are as follows: the sediment size in the lower beach surface is smaller than that in the upper beach surface and the beach shoulder area is finer. The grain size of sediment gradually decreases from the southwest of the beach to the middle, and then to the northeast, and then to the northeast. The separability of the sediment becomes better from the southwest to the middle, and from the middle to the northeast. The grain size change of the whole beach is about zonal distribution. In winter, the beach sediment particles are mainly coarse sand, and the sediment particles are medium-sized, while in summer, the sediment particles are mainly medium-fine sand, and the sediment particles are better sorted. The magnetic susceptibility values of different grain size sand samples are obviously different, in which the magnetic susceptibility value of fine particles with 0.063~0.125mm particle size is much higher than that of other grain grades (1 ~ 2 orders of magnitude higher). This is due to the fact that the particles of magnetic minerals (such as magnetite) which control the beach magnetism are mainly concentrated in the fine particles with the size of 0.063~0.125mm. It is found that the beach magnetic minerals are mainly magnetite, followed by ilmenite and a small amount of hematite by extraction, identification under microscope and electron probe analysis.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P748
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