Discription of coastal shape at Bykovsky Peninsula

This article presents a comparison of sediment input by rivers and by coastal erosion into both the Laptev Sea and the Canadian Beaufort Sea (CBS). New data on coastal erosion in the Laptev Sea, which are based on field measurements and remote sensing information, and existing data on coastal erosion in the CBS as well as riverine sediment discharge into both the Laptev Sea and the CBS are included. Strong regional differences in the percentages of coastal erosion and riverine sediment supply are observed. The CBS is dominated by the riverine sediment discharge (64.45210**6 t/a) mainly of the Mackenzie River, which is the largest single source of sediments in the Arctic. Riverine sediment discharge into the Laptev Sea amounts to 24.10210**6 t/a, more than 70% of which are related to the Lena River. In comparison with the CBS, the Laptev Sea coast on average delivers approximately twice as much sediment mass per kilometer, a result of higher erosion rates due to higher cliffs and seasonal ice melting. In the Laptev Sea sediment input by coastal erosion (58.4210**6 t/a) is therefore more important than in the CBS and the ratio between riverine and coastal sediment input amounts to 0.4. Coastal erosion supplying 5.6210**6 t/a is less significant for the sediment budget of the CBS where riverine sediment discharge exceeds coastal sediment input by a factor of ca. 10.本文对比了河流与海岸侵蚀向拉普捷夫海（Laptev Sea）及加拿大波弗特海（Canadian Beaufort Sea, CBS）输入的沉积物量。本研究纳入了基于野外实测与遥感信息获取的拉普捷夫海海岸侵蚀新数据，以及加拿大波弗特海海岸侵蚀的现有数据，同时涵盖了向这两个海域输入的河流沉积物通量数据。研究发现海岸侵蚀与河流沉积物供给的占比存在显著区域差异。加拿大波弗特海的沉积物输入以河流沉积物通量为主，通量达64.45×10^6 吨/年，其主要来源为马更些河——这是北极地区最大的单一沉积物来源。向拉普捷夫海输入的河流沉积物通量为24.10×10^6 吨/年，其中超过70%来自勒拿河。与加拿大波弗特海相比，拉普捷夫海沿岸每公里平均输出的沉积物质量约为其两倍，这一差异源于更高的崖岸高度与季节性海冰消融带来的更高侵蚀速率。因此在拉普捷夫海，海岸侵蚀输入的沉积物（58.42×10^6 吨/年）所占比重高于加拿大波弗特海，河流与海岸沉积物输入的比例约为0.4。加拿大波弗特海的沉积物收支中，海岸侵蚀仅贡献5.62×10^6 吨/年，占比相对较低；该海域的河流沉积物通量约为海岸侵蚀输入量的10倍。