The aim of this paper is to quantify and map the impact of the post‐Little Ice Age climate change on the coastal evolution on three glacier catchments in the Kongsfjorden area in Svalbard. Climatic data at Ny‐Alesund indicate an increase in the annual mean air temperature of +4 °C from 1969 to 2016 and an increase in precipitation. On the northern coast of the Brogger Peninsula, the Austre Lovenbreen, Midtre Lovenbreen, and Vestre Lovenbreen glaciers have experienced a net retreat in response to changing meteorological conditions. Because of this retreat, the glaciers have disclosed a large area of 7 km2 composed of terrigenous sediments. These sediments are transported by runoff and created coastal sandur deltas. Channel network behavior has been studied using the computation of the active floodplain width by photointerpretation, which decreased in average from 1966 to 2010. This demonstrated a contraction of the active braided belt and a decrease in the number of braided channels. A photointerpretation analysis combined with acquisition of dGPS data during field work shows a mean shoreline progradation of +0.16 m a−1 from 1966 to 2016, with a maximal advance of +82 m seaward. Since 1966, coastal progradation has decreased in time with higher mean values at the beginning of the studied period and an erosional trend from 1990. The sublittoral area was studied using analog side scan sonar in 2009, 2011, 2012, and 2017. Three prodeltas were identified and underwent a huge extension from 2009 to 2017. In the light of this knowledge, our main conclusion is that, by retreating, glaciers have an impact on the sediment availability and on the capacity of the fluvial system to effectively transport sediment to the shoreline. These two factors control the overall coastal evolution by regulating the sediment supply to the coastal area. The coastal zones that were fed with sediments by runoff have experienced a coastal progradation, and those that lost this supply have undergone a coastal recession. Due to the contraction of proglacial floodplains, current progradation concerns restricted coastal areas.

中文翻译：

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冰河沿岸对冰川退缩和河流泛滥平原在十年时间尺度（1966-2016）中的相关变化的反应，斯瓦尔巴群岛孔斯峡湾。

本文的目的是量化和绘制后小冰河时代气候变化对斯瓦尔巴群岛 Kongsfjorden 地区三个冰川集水区沿海演化的影响。Ny-Alesund 的气候数据表明，从 1969 年到 2016 年，年平均气温升高了 +4 °C，并且降水量增加。在布罗格半岛北部海岸，Austre Lovenbreen、Midtre Lovenbreen 和 Vestre Lovenbreen 冰川因气象条件的变化而经历了净退缩。由于这次退缩，冰川暴露了由陆源沉积物组成的7平方公里的大面积。这些沉积物通过径流运输并形成沿海桑杜尔三角洲。已使用光解法计算活动洪泛区宽度来研究河道网络行为，从 1966 年到 2010 年平均下降。这表明活跃编织带的收缩和编织通道数量的减少。结合实地工作期间获取 dGPS 数据的光解译分析显示，从 1966 年到 2016 年，平均海岸线进积为 +0.16 ma-1，最大推进为 +82 m。自 1966 年以来，海岸进积随着时间的推移而减少，研究期间开始时平均值较高，从 1990 年开始出现侵蚀趋势。 2009、2011、2012 和 2017 年使用模拟侧扫声纳研究了亚沿海地区。三个前三角洲是确定并经历了从 2009 年到 2017 年的巨大扩展。根据这些知识，我们的主要结论是，通过撤退，冰川对沉积物的可用性和河流系统将沉积物有效输送到海岸线的能力有影响。这两个因素通过调节沿海地区的沉积物供应来控制整个沿海演变。通过径流获得沉积物的沿海地区经历了沿海进积，而失去这种供应的沿海地区则经历了沿海衰退。由于前冰河漫滩的收缩，目前的进积涉及有限的沿海地区。