發(fā)布時間：2018-04-27 07:04

  本文選題：山東半島北部近岸海區(qū) + 沉積動力環(huán)境��； 參考：《中國海洋大學(xué)》2014年碩士論文

【摘要】：本文以山東半島北部近岸海區(qū)為研究區(qū)域，對表層沉積物進(jìn)行了粒度、黏土礦物及重金屬元素特征研究，，討論了研究區(qū)現(xiàn)代沉積動力環(huán)境、沉積物物源、沉積環(huán)境以及重金屬污染狀況，著重對沉積環(huán)境和沉積物物源進(jìn)行了研究。 查明了山東半島北部近岸海區(qū)表層沉積物分布特征。黏土質(zhì)粉砂分布最為廣泛，約占研究區(qū)面積的60%以上；砂質(zhì)粉砂主要集中在山東半島東部近岸局部區(qū)域；粉砂質(zhì)砂主要集中在東北部和成山頭南部局部區(qū)域。 研究區(qū)可劃分為A、B、C、D四個區(qū)。A區(qū)和C區(qū)內(nèi)沉積物主要集中Pejrup分類圖的C類和Ⅳ類區(qū)內(nèi)，表示水動力相對較弱，顆粒物以遞變懸浮組分為主；B區(qū)和D區(qū)內(nèi)沉積物主要集中在Pejrup圖的C、D類和Ⅲ類區(qū)內(nèi)，說明介質(zhì)擾動程度低，顆粒物以均勻懸浮組分為主。運用Gao-Collins法進(jìn)行粒徑趨勢分析的結(jié)果表明，當(dāng)Der≥0.2時，能較好地反映出沉積物的凈輸運趨勢。 采用高密度采樣（采樣網(wǎng)格間距約為8×5km）揭示了沿岸侵蝕區(qū)和沿岸流沉積區(qū)，研究區(qū)沉積動力具有較好的分帶性，可分為沿岸砂質(zhì)區(qū)和沿岸泥質(zhì)沉積區(qū)。砂質(zhì)區(qū)為侵蝕區(qū)或強(qiáng)動力區(qū)，潮流和波浪強(qiáng)；泥質(zhì)區(qū)水動力環(huán)境相對較弱，為黃海沿岸流控制區(qū)域。近岸局部區(qū)域受地形影響，形成環(huán)流區(qū)，造成沉積物顆粒變細(xì)。 伊利含是研究區(qū)內(nèi)的優(yōu)勢黏土礦物，其含量比長江和黃河中的低；蒙脫石在研究區(qū)含量分布不均勻，明顯高于黃河和長江物質(zhì)；高嶺石含量與黃河和長江物質(zhì)非常接近；綠泥石含量明顯低于黃河和長江的物質(zhì)。分析結(jié)果表明，研究區(qū)的沉積物主要來自于黃河。 使用地質(zhì)累計指數(shù)法、富集因子法和潛在生態(tài)危害指數(shù)法對海底表層沉積物進(jìn)行了重金屬環(huán)境評價，結(jié)果表明研究區(qū)重金屬含量屬于清潔水平，生態(tài)危害程度低。
[Abstract]:In this paper, the grain size, clay minerals and heavy metal elements of the surface sediments are studied in the near shore area of the northern Shandong peninsula. The modern sedimentary dynamic environment, the source of sediment, the sedimentary environment and the pollution of heavy metals in the study area are discussed, and the environment of sedimentation and the source of sediment are studied.
The distribution characteristics of surface sediments in the northern coastal area of Shandong Peninsula are found out. The distribution of clay silt is most extensive, accounting for more than 60% of the area of the study area; sand silt is mainly concentrated in the local area of the east coast of Shandong Peninsula; silty sand is mainly concentrated in the northeast and the southern part of the south of Chengshan.
The study area can be divided into A, B, C, and D four regions,.A region and C area, which mainly concentrate in the C and class IV regions of Pejrup taxonomy, indicating that the hydrodynamic forces are relatively weak and the particles are mainly in the variable suspension components, and the sediments in B and D areas are mainly concentrated in C in the Pejrup map and in class III regions, indicating that the degree of medium disturbance is low and the particles are suspended evenly. The results of particle size trend analysis using the Gao-Collins method show that when Der is greater than 0.2, the net transport trend of sediments can be better reflected.
The coastal erosion area and coastal flow depositional area are revealed by high density sampling (sampling grid spacing of about 8 x 5km). The sedimentary dynamic of the study area has good zonation, which can be divided into coastal sandy area and coastal argillaceous area. The sandy area is an eroded area or strong dynamic zone, and the tidal wave and wave wave are strong. The hydrodynamic environment of the muddy area is relatively weak, which is the Yellow Sea. The coastal area is controlled by the topography, which results in the formation of the circulation area, resulting in finer sediment particles.
Yili is the dominant clay mineral in the study area, its content is lower than that in the Yangtze River and the Yellow River; the content distribution of montmorillonite in the study area is uneven, obviously higher than that in the Yellow River and the Yangtze River; the content of kaolinite is very close to the substance in the Yellow River and the Yangtze River; the content of the chlorite is obviously lower than that of the the Yellow River and the Yangtze River. The sediments are mainly from the Yellow River.
The heavy metal environment was evaluated by the accumulation factor method, the enrichment factor method and the potential ecological hazard index method. The results showed that the heavy metal content in the study area belonged to the clean level and the ecological harm was low.

【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P736.2

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