利用水利专业营业翻译以下句子：三峡工程成库蓄水后库区的水位抬升、水域扩大。库区水位在145m-175m调度运行时水位变幅高达30m而在库区峡谷河段使用的传统航标主要是以绝壁平台标为主平台较简易维护难度大其中在低水位时需要人工进行航标移位而钢爬梯使用年限久易生锈损坏因此维护人员存在极大安全风险等问题为改善库区峡谷河段航标维护难题自适应水位航标装置应运而生同时随着库区水位抬升航道条件改善船舶流量增加船

After the Three Gorges Project was filled with water, the water level in the reservoir area rose and the water area expanded. When the water level in the reservoir area was operated between 145m and 175m, the water level fluctuated by up to 30m. Traditional navigation marks used in the canyon river section of the reservoir area mainly consisted of cliff platform marks, which were relatively simple and difficult to maintain. Artificial relocation of navigation marks was required during low water levels, and steel climbing ladders had a long service life but were prone to rust and damage, resulting in significant safety risks for maintenance personnel. In order to improve the maintenance of navigation marks in the canyon river section of the reservoir area, the adaptive water level navigation mark device was developed. With the rise of the water level in the reservoir area, the navigation conditions improved, the ship traffic increased, and the ships developed towards larger sizes. The environmental loads such as wind waves, ship waves, and canyon winds became extremely complex, posing significant challenges to the safe operation of the adaptive water level navigation mark device. Therefore, conducting a motion response analysis of the adaptive water level navigation mark device under complex environmental loads and exploring the stress laws of the navigation mark structure is of great theoretical and practical value for ensuring the long-term safe and stable operation and promotion of the navigation mark device.

This paper focuses on the adaptive water level navigation mark device and uses three-dimensional potential flow theory and hydrodynamic software ANSYS/AQWA to conduct numerical simulation and explore the motion response and stress characteristics of the adaptive water level navigation mark device under complex environmental loads. The main work and achievements of the paper are as follows:

(1) The hydrological conditions of the navigation facilities in the reservoir area and the composition, characteristics, and adaptability of the adaptive water level navigation mark device were systematically analyzed.

(2) A hydrodynamic analysis model of the adaptive water level navigation mark device was established. Based on the AQWA-LINE module, the hydrodynamic performance of the navigation mark device was analyzed in the frequency domain, and the hydrodynamic characteristic parameters such as the response amplitude operator (RAO), added mass, radiation damping, first-order wave force, and second-order wave force were calculated.

(3) Based on the results of frequency domain analysis, the time domain analysis of the adaptive water level navigation mark device under single regular waves and pure flow was conducted. The results showed that the motion amplitudes of the navigation mark device in the transverse, longitudinal, and bow directions were small, and the stresses on each guide unit were extremely unbalanced. The stress forms of the guide units were summarized.

(4) The time domain analysis of the adaptive water level navigation mark device under complex environmental loads was conducted, and the influence of environmental variables such as wave height, water depth, and flow velocity on the motion response and stress characteristics of the navigation mark device was studied. The results showed that the environmental water depth had a small influence on the motion response and stress characteristics of the navigation mark device. Meanwhile, the motion response and stress characteristics of the navigation mark device were more sensitive to changes in wave height. As the wave height increased, the motion response and stress of the device also increased significantly. Due to the interaction between wind load, flow load, and structure, the motion response of the device in all directions under wind-wave-flow was better than that under wave-flow coupling.