Kunshan, a typical river network city located in the Taihu Plain, has a dense network of rivers, with upstream receiving discharge from rivers and downstream supported by multiple tributaries entering the Yangtze River. Additionally, the city’s internal embanked areas are numerous. Furthermore, the existing information system was constructed prematurely and lacks professional forecasting and simulation technologies, making it difficult to fully grasp the current water security situation and rapidly display the effects of scheduling plans. This study analyzes the “Four-Preparation” integration and proposes improvements. Based on Kunshan’s current situation, the goal is to construct an Integrated Four-Preparation System, establishing a scientific coupling system for forecasting, early warning, rehearsal, and contingency planning. This will strengthen intelligent and smart development applications to achieve scientific disaster reduction.

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With the acceleration of urbanization, flood control and drainage management in cities are facing increasing challenges. As a nationally recognized model for effective flood control, Suzhou Industrial Park has experienced frequent extreme weather events in recent years, highlighting the urgent need for informatization in flood control and drainage management. This paper provides a detailed introduction to the design scheme of the flood control and drainage decision-making command information system for Suzhou Industrial Park, covering key aspects such as system requirement analysis, overall architecture, core technologies, and risk management. By integrating multi-source data, including meteorology, hydrology, waterlogging points, and the sewage pipeline network, the system establishes a comprehensive flood control and drainage decision-making platform featuring situational awareness, monitoring and early warning, and command and dispatching functions. The system aims to enhance the flood control and drainage capabilities of the park, ensure urban safety, and provide a reference for the informatization of flood management in other cities.

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The assessment of river and lake health is a crucial aspect of waterbody management and serves as an important measure for evaluating the effectiveness of the river and lake chief system. This study focuses on the health assessment of two rivers (Qingyang Port and Changqianlu Port) and five lakes (Wangyang Lake, Changbaidang, Mingjingdang, Tianhuadang, and Dianshan Lake) within Kunshan City in 2023. The assessment is conducted seasonally across four major categories: natural ecology, service functions, disturbance levels, and management effectiveness. Twelve indicators are selected from each of the four criterion layers—basin, water, biological, and social service functions—to evaluate the health of the rivers and lakes. The results indicate an overall excellent health status of the rivers and lakes. Furthermore, key influencing factors are analyzed, health issues are summarized, and relevant recommendations are proposed.

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During a vehicle accelerated corrosion test, a front coil spring in the MacPherson suspension system of an SUV exhibited fracture failure. The results indicated that the material composition, microstructure, and decarburization layer of the coil spring met the technical requirements; however, the tempering hardness was found to be excessively high. Fracture surface analysis revealed a small amount of intergranular cracking in the crack initiation zone, and the crack propagation zone exhibited ductile tearing characteristics, ultimately leading to fatigue fracture. Through force analysis, it was determined that the coil spring was subjected to lateral loads. Additionally, ABAQUS software simulations revealed that during wheel hop conditions, the coil spring end coil came into contact with the spring seat, leading to coating failure and the formation of surface fatigue defects. Based on these findings, an improvement plan was proposed, followed by failure reproduction and optimization validation in a test rig.

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