To study the viscosity coefficient and thickness of the viscous layer on the Tibetan Plateau, the relationship between the change in viscosity coefficient and thickness of a lower crustal flow and the change in elevation has been investigated based on the principle of a pipeline flow with different viscosity and thickness of terrain elevation. The viscosity and thickness of the lower crustal flow in different directions were determined based on the changes in the terrain along different directions on the Tibetan Plateau. The following results were obtained: (1) The greater the viscosity and the smaller the thickness of the lower crustal conduit flow, the steeper the ground elevation change formed; (2) The maximum viscosity coefficient in the region from India to the Kunlun Mountains in the southern Tibetan Plateau through the Himalayan boundary is approximately 10²⁰Pas, and the thickness of the conduit flow is approximately 25 km. (3) The maximum value of the viscosity coefficient of the lower crustal flow in the region ranging from the Tibetan Plateau to the Qinghai- Gansu section is attained when the flow thickness in this region approaches 40 km (4) The maximum value of the viscosity coefficient of the lower crustal flow in the region ranging from the Tibetan Plateau to the Qinghai- Gansu section is attained when the flow thickness in this region approaches 40 km., which does not substantially differ from that of the region ranging from the Tibetan Plateau to the Qinghai-Gansu area. (5) The maximum viscosity coefficient of the lower crustal flow from the southeast of the Tibetan Plateau to Yunnan is approximately 10¹⁸Pas, and the thickness is approximately 32 km, which differs from the flow thickness in the Sichuan Basin and Qinghai-Gansu regions. The results show variations in the viscosity of the flow along different directions on the Tibetan Plateau, in addition to considerable variation in the thickness of the lower crustal channel flow from region to region, with the overall characteristics of thinness in the west and thickness in the east. The results of the four profiles reveal that the channel flow thickness is the steepest at the southwest border of the Tibetan Plateau with India. This paper presents a reasonable interpretation of the geomorphology of the Tibetan Plateau using different thickness and viscosity coefficients of the lower crustal channel flow model. In this paper, a possible mechanism for the formation of the Tibetan Plateau topography is explained using a horizontal pipe flow for four profiles of the Tibetan Plateau.

为研究青藏高原粘性层的粘性系数和厚度，基于不同粘性管道流的原理，研究了下地壳流粘性系数和厚度的变化与高程变化的关系和地形高程的厚度。根据青藏高原沿不同方向的地形变化，确定了不同方向下地壳流的粘度和厚度。得到以下结果： (1) 下地壳管道流黏度越大、厚度越小，形成的地面高程变化越陡；²⁰ Pas，管流厚度约为25 km。(3) 青藏高原至青甘剖面低地壳流粘性系数最大值在该区域流动厚度接近40 km时达到 (4) 粘性最大值青藏高原至青甘断面的下地壳流系数是在流厚度接近40 km时得到的，与青藏高原至青甘断面的低地壳流系数无显着差异青甘地区。(5) 青藏高原东南部流向云南的下地壳流最大黏度系数约为10 ¹⁸ Pas，厚度约为32 km，与四川盆地和青甘地区的流动厚度不同。结果表明，青藏高原沿不同方向的水流黏度变化较大，下地壳沟道水流厚度区域间差异较大，总体呈现西细北厚的特征。东方。4个剖面结果表明，河道流厚度在青藏高原与印度的西南边界处最为陡峭。本文提出了利用下地壳通道流模型的不同厚度和粘性系数对青藏高原地貌的合理解释。在本文中，