Efficient Identification of water conveyance tunnels siltation based on ensemble deep learning

The inspection of water conveyance tunnels plays an important role in water diversion projects. Siltation is an essential factor threatening the safety of water conveyance tunnels. Accurate and efficient identification of such siltation can reduce risks and enhance safety and reliability of these projects. The remotely operated vehicle (ROV) can detect such siltation. However, it needs to improve its intelligent recognition of image data it obtains. This paper introduces the idea of ensemble deep learning. Based on the VGG16 network, a compact convolutional neural network (CNN) is designed as a primary learner, called Silt-net, which is used to identify the siltation images. At the same time, the fully-connected network is applied as the meta-learner, and stacking ensemble learning is combined with the outputs of the primary classifiers to obtain satisfactory classification results. Finally, several evaluation metrics are used to measure the performance of the proposed method. The experimental results on the siltation dataset show that the classification accuracy of the proposed method reaches 97.2%, which is far better than the accuracy of other classifiers. Furthermore, the proposed method can weigh the accuracy and model complexity on a platform with limited computing resources.     

Cause of flow distributor on flow uniformity in open waterway stream passage velocity comparisons

In an open waterway flow passage, the inclusion of flow distributor paves a way to understand the idea of flow uniformity of the water along the upstream side and prevents non-uniform flow of water besides the passage length as a function of flow rate. The interesting idea in the flow distributor is its length and porosity. The essential conditions that should be satisfied are: there should not be any turbulence and there should be a possibility of achieving uniform circumferential flow in the flow passage. The other critical issue is the accurate measurement of low velocity of water. In this paper, a propeller-turbine-type anemometer is specially designed, fabricated and calibrated to measure the local velocity of water in the range of 0.001–0.01 m/s. This paper signifies how the flow uniformity is achieved by varying the size and porosity of the flow distributor.     

上海金山区污水排海工程排污口位置的比选

上海市金山区污水海洋处置工程需要确定合适的排污口位置，为此分析了金山区金山嘴附近的海域水深分布状况、海床冲淤时空变化以及岸滩与海床的稳定性等，对金山区市政污水排海工程排污口的几个设置方案进行了比选研究，最终确定了最佳排污口位置。     

长江陆溪口水道航道整治方案研究

陆溪口水道是长江中游的重点浅水道之一,由于汊道的兴衰交替,航槽也相应变迁,另外由于直港进口、中港汊道中部及出口处碍航浅滩的存在,导致航道维护困难。根据河床演变特点,确定稳定洲滩、增加直港进口分流、改善直港航行条件的工程措施。近十年河势相对稳定,但中港仍在持续弯曲发展,应抓住有利时机对该水道加以整治。     

三维数字航道的设计与实现

针对我国内河航道水深季节变化大、航行安全要求高的特点,本文运用虚拟现实、三维地理信息系统、计算机图形图像处理等技术,对三维航道数据库、水下地形建模及疏浚分析、水体可视化、实时水位可视化、航标建模及可视化等关键技术进行攻关,并以长江重庆航道示范段为例,建立三维数字航道系统,支持实时航标、船舶、水位信息集成。本文在推进航道精细化管理、增强水上安全方面具有重要作用。     

探析航道护岸工程中软弱地基的处理

地基管理工作在航道护岸工程施工中占据很重要的地位,其施工质量受到多方关注。虽然工程不是很复杂,但也存在一些障碍,如对软地基的处理工作。本文对其影响因素做了简要分析,并提出了一些相关解决措施。     

对水运工程监理复测的几点看法

监理复测首先是对业主提供的控制点资料进行验证,即实测控制点的平面坐标和水准点的高程,以验证控制资料内容的附合性和适用性;其次是对施工放样点进行复测,验证其正确性和精度,确保施工测量否认质量。本文主要讨论对监理复测的几点看法。     

Ausbau des Stichkanals nach Salzgitter von SKS‐km 3,550 bis 14,918

Expansion of the branch channel to Salzgitter from SKS‐km 3,550 to 14,918 The branch channel to Salzgitter will be extended to the waterway category Vb in the next years. This will enable inland waterway vessels with a width of 11,45 m and a loaded draft of 2,80 m to run it without limitations. The reaches Wedtlenstedt and Üfingen will be extended in most areas to a trapezoidal cross section with a width at water level of 36,90 m and a water depth of 4,00 m. The exit basins of the locks will be extended on one side. Overall about 1 000 000 m² of soil will be moved. About 300 000 m² of clay sealing and 460 000 m² of rip‐rap will be installed. Three culverts have to be replaced by new constructions to adapt to the new cross section of the channel. In addition two bridges will be modified to allow for a clearance of 5,25 m. At present the plan approval procedure is carried out. It is expected to achieve the plan approval order in 2017. The construction is planned to start in 2018. Completion is scheduled for 2024.     

公共航道与港口航道关系之我见

本文对公共航道与港口航道的相同点与不同点进行了较为深入的对比分析与归纳整合,详细阐述了公共航道与港口航道应遵守的划分原则,为相关部门加强航道管理、不断改进完善法律法规提供了必要的帮助与启发。     

航道工程中自然疏浚模式的应用研究

近年来,随着港口对地区经济发展的作用越来越重要,港口的大型化发展,要求通航水深越来越深。本文研究航道内水深较大区域的自然疏浚法,并以三个实例阐述了疏浚模式的效果。最后,对自然疏浚模式的发展进行了展望。