This project belongs to the field of energy and environmental technology and water conservancy engineering technology.
Main technological innovation content
In order to improve the environmental landscape of Suzhou River and ensure its flood control safety, a series of studies were carried out on key technical issues such as whether the sediment should be dug, how to dig, how to treat and utilize the excavated sediment, and whether the flood control wall can be reduced and how to transform it: (1) Aiming at the complex characteristics of Suzhou River sediment composition, pollution characteristics and dredging impact, the source, composition, content and distribution of oxygen-consuming substances in its sediment were investigated and analyzed. Through laboratory and on-site measurement and research on the sediment oxygen consumption process, the oxygen consumption mechanism and spatio-temporal laws of Suzhou River sediment were revealed, and the release flux of pollutants in Suzhou River sediment before and after dredging was obtained; By establishing a water quality mathematical model, the spatio-temporal variation laws and environmental effects of the Suzhou River sediment after dredging were predicted and analyzed. (2) In view of the characteristics of Suzhou River's sediment with high debris, heavy pollution, and difficulty in disposal, based on the requirements of minimum dredging secondary pollution impact, highest dredging efficiency, best environmental effect, flood control safety and shipping safety, a pilot test study on the applicability of three dredging equipment, namely grab, backhoe and vacuum cutter suction, proposed environmentally friendly, efficient and economic dredging equipment and technology to transform grab, as well as multi-point synchronous tide operation methods; Key technologies such as dredging scope control, dredging process optimization, transportation system organization, as well as debris separation, sludge landing treatment and disposal, and tail water treatment and recycling have been formed. (3) In view of the comprehensive impact of Suzhou River by factors such as floods, waterlogging, tide, and control, establish and improve the digital river network hydrological and hydrodynamic model of the Suzhou River system that is seamlessly connected with the Taihu Lake Basin network, coordinate the short and long-term flood control standards of the Taihu Lake Basin. and regional drainage and waterlogging removal standards, study and propose the fortification high water level of Suzhou River under current, short-term and long-term operating conditions; solve the problem of setting the height of the flood control wall. (4) In view of the complex structure of the Suzhou River flood control wall, numerous cross-over facilities, dense buildings along the coast, and small and difficult renovation space, we will study and form a series of technologies such as the utilization of existing flood control walls, harsh environmental protection, innovative renovation of structures and flood control walls according to local conditions.
project characteristics
(1) The Suzhou River sediment flux mathematical model (SedFlux) was established and coupled with the water quality mathematical model. The water quality improvement effect and duration of Suzhou River sediment dredging were scientifically evaluated. SEM/AVS method was used for the first time to study the ecological toxicity of dredged Suzhou River sediment. (2) Innovatively formulated control targets for complex contaminated sediment dredging; developed environmentally friendly closed grab dredging equipment and technology; proposed excavation of contaminated sediment in the central Urban area river, long-distance multi-node control water transportation, debris separation and sediment landfill disposal combined process. (3) Innovate and upgrade the fine simulation technologies of rainfall generation and confluence, pump gate scheduling, centralized inflow from rainwater pumping stations and scattered inflow from ground and river network storage and drainage in response to changes in digital ground elevation distribution, revealing for the first time that the Suzhou River system encounters different water conditions. Distribution law of high water level in the Suzhou River under the influence of water conditions. (4) Creative use of gate-type structures and flood prevention wall reconstruction technologies such as non-squeezing and weak vibration pile foundations to solve the connection and protection problems of crossed and densely adjacent buildings; innovative flower grooves in front of the wall were set up according to local conditions using the front teeth of the floor to improve Waterfront ecological landscape.
application and promotion
The results proposed in the study include evaluation of sediment pollution characteristics and prediction of dredging effects, river dredging organization, technology, tail water and sediment disposal plans, and flood control wall reconstruction technology in the central Urban area. They have been successfully applied in the third phase of the Suzhou River Comprehensive Regulation Project. It provides a successful set of experience and technologies for the management of polluted sediment in urban rivers that have emerged on a large scale in China in recent years. It is highly demonstrative and has high value for promotion and application. After the application of the technology, the expected purpose has been achieved, greatly improving Shanghai's urban image and living environment, with huge social and economic benefits.