The construction of smooth drainage projects to form an efficient network system

Taihu lake is again green

With the extension of xingou river and the completion of the dredging project, taihu lake, jiangsu's "pearl on the water", will be added with another "dialysis" channel.

"The treatment of taihu lake is a complex and systematic project," he said. Chen jie, director of the jiangsu provincial water resources department.

Taihu lake governance reflects green development

As the largest freshwater lake in jiangsu, taihu lake management has become a constant battle for jiangsu. Since the 1990s, taihu lake management has been listed as an important subject. But unlike in the past, the new round of governance projects not only strengthened the role of flood control and drainage, but also highlighted the requirements of green development.

In changzhou remote view south hub, the reporter sees, here installed high-tech equipment not only, still have special fishway. Wu zhong, deputy director of the jiangsu provincial administration of construction and rehabilitation, said the fishway was built to meet the biodiversity requirements of the water ecosystem, and there are also ecological wetlands in the xingou river estuary, beiyang lake and other areas, in order to repair the impact of the project on the ecosystem.

The new round of taihu lake management plan emphasizes the principle of both protection and development. By raising the construction standards of river courses and Bridges, the project can play a better role in shipping and transportation. Through the construction of corresponding environmental protection and water and soil conservation projects, improve the ecological and landscape construction level of the project, to meet the needs of the people's living culture.

In order to protect the ecological environment along the route, jiangsu water conservancy department gives priority to using the existing water system in the engineering survey and design stage to reduce the damage to the original landform and save land resources. Among them, zoumatang, xigou river river slope revetment design, try to maintain the original landform and vegetation, or biological technology revetment revetment, reduce hardening, whitening, channelization; Or build ecological corridors and wetlands to improve the biodiversity of the region.

The office of zhu haisheng, deputy director of the water resources department of jiangsu province, hung a diagram of the comprehensive water environment treatment project in the taihu lake basin.

"Taihu lake basin's highly concentrated population and wealth, high level of input and output, high intensity of consumption and emissions, as well as the characteristics of natural geography and water system, determine the complexity and difficulty of basin governance. Build what kind of management project, how to build good management project, need us to think deeply and elaborate plan. "In the new round of governance, we will give priority to ecology and promote harmony between human and water in our engineering planning, design, construction and management," zhu said.

Diverting Yangtze river to accelerate taihu lake's "water change"

The "hanging river" over the head of wumu village, yuqi street, huishan district, wuxi city was removed. In 2014, due to the extension of xingou river dredging project, wumu village needed to open the river from the ground. The village took the opportunity to build a big dike, get through the duantou river and improve the drainage station. "Before, we because of low-lying, every year the flood season to evacuate the people, to rescue. "Now, not only is the environment in the village better, but the road on top of the embankment has been built and there is an additional landscape," said feng guoping, the village director.

The project, which will benefit wu mu village, aims to connect taihu lake to the Yangtze river. In 2007, the outbreak of the taihu lake water crisis made the water environment treatment of taihu lake a top priority. In 2008, the state council approved the "overall plan for the comprehensive treatment of water environment in the taihu lake basin", which determined the diversion and drainage projects of zoumatang, xigou and xinmeng rivers, and formed a new water diversion pattern of "three diversion and two drainage" with the former wangyu and taipu rivers. "The construction of water diversion and drainage projects will greatly promote the exchange of water between taihu lake and the Yangtze river, so that the rate of water exchange in taihu lake will be promoted from once a year to twice a year, thus improving the water environment capacity of taihu lake basin, improving the water environment of taihu lake and surrounding areas, and creating conditions for the self-restoration of the water ecology of taihu lake. He yong, deputy director of the construction management bureau of jiangsu province, explained.

Xingou river extension dredging project as one of the river diversion channels, taihu lake and the Yangtze river can be fully open. Xu chunlei, director of wuxi's key water conservancy engineering construction management office, said that after opening, the channel can be used as a clear water channel, will be taihu meiliang lake water north of the Yangtze river, but also the Yangtze river water supplement taihu.

Construction of xinguo river extension dredging project started in 2013, took 4 years and cost 5.6 billion yuan. By 2017, the main project has been basically completed.

Scientific and technological innovation ensures project quality

The layout of the "three channels and two platoons" will guarantee the restoration of the beauty of taihu lake. However, to connect taihu lake with the Yangtze river, these projects need to solve many difficulties.

Xinmeng river extension and dredging project is a key diversion and drainage project for the comprehensive treatment of water environment in taihu lake basin. The project is located at the intersection of xinmeng river and beijing-hangzhou canal in benniu town, with beijing-shanghai high-speed railway and shanghai-nanjing intercity on the north, beijing-hangzhou canal on the south, villagers' residential area on the west, and jiuli primary school and the main town of benniu town on the east.

"This requires that our construction projects not only affect the safety of railway operation, but also ensure the normal operation of various pipelines." Wang jian, director of the construction department of the new menghe benniu junction project in jiangsu province, admitted that it is not easy to solve these problems at the same time while ensuring the progress of the project. Moreover, before the construction of the project, a lot of coordination work should be completed, such as the rereading of the beijing-hangzhou canal and the interruption of navigation and flow of the new menghe river.

In order to speed up the progress of the project, the water conservancy department of jiangsu province, on the one hand, merged the project that was originally planned to be implemented in two phases -- the first phase of ship lock, control lock, mengjiu bridge project, and the second phase of overpass culvert and diversion river project into the first phase to shorten the construction time; Second, the construction time of main projects should be compressed, and the main projects such as overpass culvert, ship lock and control lock should be completed before flood season of 2019 as far as possible.

"We also do a lot of innovation in engineering. For example, the ground settlement is required to be no more than one millimetre for the high-speed railway, otherwise it will affect the operation safety. In order to avoid vibration caused by high-speed railway operation, we also adopted composite pile of stiffness for the first time, which is very suitable for the treatment of soft foundation along the river, economical and practical. Zhou fujun, deputy general manager of jiangsu yancheng water conservancy construction co., said the project is proceeding according to the scheduled schedule.

Since 2007, jiangsu has completed 9 key projects for the comprehensive management of the taihu lake basin, and 3 projects are under construction. These projects and the implementation of comprehensive treatment measures of taihu lake, let the water quality of zhushan lake, meiliang lake and the western lake area of taihu lake from five categories of water quality to four categories of water quality, taihu lake blue wave beauty is gradually emerging.