發(fā)布時(shí)間：2018-08-10 17:03

【摘要】：北海(North Sea)被現(xiàn)在的大不列顛島、斯堪的納維亞半島、日德蘭半島和荷比低地等圍繞,主體是一個(gè)自南向北傾斜加深的陸架沉積盆地。隨冰后期海面上升,北海南部瓦登海(Wadden Sea)發(fā)育了廣闊的潮灘海岸。北海南部日德蘭半島西岸Lunden灣古o_湖進(jìn)行野外調(diào)查,利用重力取樣器自埋深53 cm始獲取了719 cm長(zhǎng)的無(wú)擾動(dòng)高取芯率沉積柱LN,并對(duì)上部53 cm進(jìn)行現(xiàn)場(chǎng)觀測(cè)與分層取樣。對(duì)沉積柱沉積物結(jié)構(gòu)構(gòu)造、粒度和燒失量的測(cè)試,及沉積物粒度數(shù)據(jù)的EMMA進(jìn)行分析。研究表明:這一地區(qū)主要保留了河流沉積(EM1)、潮流沉積(EM2)與波浪/風(fēng)暴沉積(EM3)。早期,波浪/風(fēng)暴作用為主(EM3)。繼而,潮流動(dòng)力主控(EM2)。隨之,河流影響(EM1)不斷加強(qiáng),海洋作用逐漸減弱,乃至消失。與沉積構(gòu)造和燒失量數(shù)據(jù)結(jié)合,EM3有效揭示了多段風(fēng)暴沉積物。依據(jù)AMS14C測(cè)年結(jié)果,結(jié)合研究區(qū)海面變化背景,指示了6050 cal.a BP以來(lái)Lunden灣在河—海相互作用下,先后經(jīng)歷了海灣、水下沙壩—o_湖、半封閉沙壩—o_湖和封閉沙壩—o_湖的海退型沙壩—o_湖海岸演化過(guò)程,最終在5150cal.a BP發(fā)育為濱海濕地。
[Abstract]:The North Sea (North Sea) is surrounded by the present Great Britain, Scandinavia, Jutland and Hobbit lowlands, and the main body is a continental shelf sedimentary basin with a deepening tilt from south to north. With the rise of the postglacial sea, (Wadden Sea) in the Wadden Sea in the south of the North Sea developed a wide tidal beach coast. Field investigation was carried out on the ancient lake of Lunden Bay on the west coast of Jidelan Peninsula in the south of North Sea. By using gravity sampler, 719 cm long undisturbed high coring rate sediment column LNs were obtained from the depth of 53 cm, and the upper 53 cm was observed and stratified. The structure, grain size and burning loss of sediment were measured, and the EMMA of sediment granularity data were analyzed. The results show that the fluvial deposition (EM1), tidal current deposition (EM2) and wave / storm deposition (EM3) are mainly retained in this area. In the early stage, wave / storm action was dominant (EM3). Then, the main power flow control (EM2). Along with it, the river influence (EM1) is becoming stronger and the oceanic action is weakening or even disappearing. Combined with sedimentary structure and loss of burning data, EM3 effectively revealed multi-stage storm sediments. Based on the AMS14C dating results and the sea level variation background in the study area, it is indicated that since 6050 cal.a BP, the Lunden Bay has experienced the gulf and underwater sanddam _ olake since 6050 cal.a BP under the interaction of the river and sea. The coastal evolution process of the semi-enclosed sand dam -o_ lake and the closed sand dam -o_ _ lake is finally developed into a coastal wetland in 5150cal.a BP.
【作者單位】： 南京大學(xué)地理與海洋科學(xué)學(xué)院;南京大學(xué)海岸與海島開(kāi)發(fā)教育部重點(diǎn)實(shí)驗(yàn)室;江蘇第二師范學(xué)院城市與資源環(huán)境學(xué)院;國(guó)家海洋局海底科學(xué)重點(diǎn)實(shí)驗(yàn)室;Institute
【基金】：外專千人計(jì)劃:“青藏高原全新世環(huán)境與水文變化研究”(2014-2017) 2014-2016 Deutscher Akademischer Austausch Dienst Project(57090188)
【分類號(hào)】：P736.2

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