We present the study of a subglacial drainage system that developed in the base of the Scandinavian Ice Sheet at the border of the Silesian Lowland and Silesian Upland (southern Poland) during the Drenthian Glaciation as a result of large outburst flood events. This drainage system was characterised by a spatially complex structure, i.e. it was composed of an individual an N-channel (tunnel channel) incised in Mesozoic rocks, i.e. Cretaceous and Triassic marls and limestones, and an R-channel, deposits of which form a set of large esker ridges which also occur on bedrock in the SE prolongation of the tunnel channel. Unlike most known cases of the co-occurrence of such forms, the studied tunnel channel and eskers are directly related, having been formed during the same flow events. The studied forms are unique within the entire southern sector of the Scandinavian Ice Sheet, which, in Central Europe, advanced mainly over soft unconsolidated Quaternary and Neogene sediments. The tunnel channel was formed as a result of enormous erosion of the ice sheet bed. The material eroded from the channel was partially deposited in a subsequent part of the drainage system. The location and orientation of the drainage system did not result directly from water pressure gradients, but was strongly determined by the internal structure of the ice sheet, i.e. it presumably developed along the marginal part of the ice stream supplying the Upper Odra ice lobe, which represented distinct weaknesses within the ice sheet. The development of the drainage system was the effect of the drainage of meltwater stored in the ice sheet system, most probably as a supraglacial lake. Gravelly-sandy rhythms recorded within the esker succession indicate that the process of lake drainage took place in several stages, or that the lake developed and drained several times.

我们介绍了由于大爆发洪水事件而在德伦特冰河时期在西里西亚低地和西里西亚高地（波兰南部）交界的斯堪的纳维亚冰原底部发展的冰下排水系统的研究。该排水系统的特点是空间结构复杂，即它是由一个在中生代岩石（即白垩纪和三叠纪泥灰岩和石灰石）中切割的N通道（隧道通道）和一个R通道组成的，该通道的沉积物形成一组大型埃斯克海脊，也出现在隧道东南延伸的基岩上。与大多数已知的同时存在这种形式的情况不同，所研究的隧道通道和壁面直接相关，是在相同的流动事件中形成的。所研究的形态在整个北欧斯堪的纳维亚冰盖地区中是独特的，而在中欧，斯堪的纳维亚冰盖主要在软的未固结的第四纪和新近纪沉积层上发展。隧道通道是由于冰床的巨大侵蚀而形成的。从通道侵蚀的物质部分沉积在排水系统的后续部分中。排水系统的位置和方向不是直接由水压梯度引起的，而是由冰盖的内部结构强烈确定的，即，它可能是沿着向上奥德拉冰川支流的冰流的边缘部分发展的。代表了冰盖内明显的弱点。排水系统的发展是冰原系统中存储的融化水的排水作用，最有可能是冰川湖。埃斯克演替过程中记录的砾石流沙节律表明，湖泊排水过程分几个阶段发生，或者湖泊发育和排水几次。