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首页> 外文期刊>Polar biology >Coastal evolution and sedimentary mobility of Brogger Peninsula, northwest Spitsbergen
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Coastal evolution and sedimentary mobility of Brogger Peninsula, northwest Spitsbergen

机译：斯匹次卑尔根西北部布罗格半岛的沿海演变和沉积活动性

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摘要

Since the end of the Little Ice Age (LIA), Svalbard glaciers have undergone a net retreat in response to changing meteorological conditions. Located between 76A degrees N and 80A degrees N, western Spitsbergen has seen a climatic transition from a glacial to a paraglacial system. On the northern shore of the Brogger Peninsula (northwest Spitsbergen), the average temperature increased by 3 A degrees C between 1965 and 2015, and cold-based valley glaciers have retreated more than 1 km from their LIA limits. This rapid deglaciation has exposed large areas of glacigenic sediments being easily reworked by runoff. This has led to the formation of extensive glacier-river delta systems and coastal progradation. Post-LIA coastal progradation and formation of new landforms in Kongsfjorden have been controlled predominantly by substantial availability of glacial sediment. A combination of aerial photographic and field data has been employed to estimate the post-LIA evolution of coastal sandur deltas and their submarine parts (named here "prodeltas"). The data set reveals that delta shoreline advance could have reached around 5 m/year. between 1966 and 1990 for the most energetic delta of Austre Lovenbreen, and around 4 m/year between 2011 and 2014 for the most energetic delta of Midtre Lovenbreen. The prodeltas registered a net growth from 2009 to 2012: the biggest, located in the prolongation of deltas of Austre Lovenbreen, measured 1033 m in length in 2009 and 1180 m in length in 2012. This substantial amount of sediment supplied in the fjord has an impact on the fjord ecology, especially on the benthic ecosystem.
机译：自小冰河时代（LIA）结束以来，斯瓦尔巴德冰川由于气象条件的变化而净退缩。斯匹次卑尔根西部位于北纬76A至北纬80A之间，气候已从冰川系统转变为副冰川系统。在Brogger半岛的北岸（斯匹次卑尔根州西北部），1965年至2015年之间，平均温度上升了3 A摄氏度，而冷基山谷冰川已经从LIA极限退回了1多公里。这种快速的冰消作用使大面积的冰川成因沉积物容易被径流重新加工。这导致形成了广泛的冰川河三角洲系统和沿海退化。 LIA后沿海地区的扩张和新地形的形成主要受到冰川沉积物大量供应的控制。航空摄影和野外数据相结合，已被用于估计LIA后沿海桑杜尔河三角洲及其海底部分（此处称为“三角洲”）的演变。数据集显示，三角洲海岸线前进可能达到约5 m /年。对于最活跃的Austre Lovenbreen三角洲，在1966年至1990年之间；对于最活跃的Midtre Lovenbreen的三角洲，2011年至2014年之间约为4 m /年。从2009年到2012年，三角洲出现净增长：最大的三角洲位于Austre Lovenbreen三角洲的延长线上，2009年的长度为1033 m，2012年的长度为1180 m。对峡湾生态，尤其是对底栖生态系统的影响。

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