With the continuous development of society, people's efforts to develop rivers are increasing, and the demand for water resources is also increasing. River management faces many challenges. In the process of development, people should not only give full play to the traditional functions of rivers such as power generation, shipping, water conservancy, irrigation and tourism, but also ensure the ecological balance of river systems, maintain the balance between natural environment and economic benefits, and rationally utilize and fully protect river resources. In the past, in order to meet people's development needs and give consideration to the safety performance of the project, hard and impervious structural materials were often used as the main design materials, and the attention to environmental protection and ecological restoration of rivers was far from enough. Therefore, channelization of rivers is an important problem to be solved in river management and ecological restoration. It can be seen that river management and ecological restoration are important contents to ensure the healthy development of rivers. Based on the above viewpoints, this paper analyzes the problems of river management and ecological restoration based on the concept of healthy development of rivers.

2 River regulation and ecological restoration

2. 1 river state

In recent years, China has taken many measures in river management, but there are still many problems in river ecological environment, such as serious water pollution, shortage of water resources and frequent floods, which have seriously affected economic development. Although the progress of water conservancy project construction is obvious to all, there is also a problem of changing the original river ecosystem behind the achievements. Rivers are gradually drying up, the water ecological environment is being destroyed day by day, the function of rivers is declining, and water pollution is becoming more and more serious. From the above phenomenon, it can be seen that for the normal development of society and the increasing attention of the international community to environmental protection, it is urgent to harness rivers and restore the ecological environment of water resources.

The natural environment of rivers plays a very important role in the ecosystem, and the natural structure and morphology have a very favorable influence on the reproduction and growth of natural organisms. Because the river itself has the ability of self-repair, too much human intervention, such as artificial river reconstruction and repair, may have adverse effects. Therefore, too much artificial transformation will inevitably lead to changes in water quality, river flow and other aspects, thus causing the ecological balance of rivers to be broken, leading to the forced migration, death and even extinction of organisms that are highly dependent on rivers due to the destruction of the ecological environment.

In the process of river regulation, it is bound to change the original shape of the river. For example, measures such as river interception, deep excavation, narrowing, widening and bending are often used in river regulation, which will reduce the overall area and hardening range of the river to a certain extent, and increase the impervious capacity of the river bed, resulting in insufficient water supply in cities, seriously affecting the supply of tap water in cities, and leading to insufficient water for production and living of residents. Natural rivers are mostly winding and circling, which can store and regulate floods and reduce the impact of floods. However, due to man-made reconstruction, the modern river channel is washed away by steel bars, which seriously weakens the fluidity of the river channel, and the water body cannot be freely exchanged, which seriously increases the incidence of flood disasters and reduces the flood discharge capacity of the river channel, which has a great impact on the urban flood control and waterlogging prevention system.

There is a lot of vegetation around natural rivers. In the process of river regulation, the vegetation environment around the river will be destroyed, and the natural scenery along the river will be greatly reduced, which will have a devastating impact on urban tourism with the theme of river culture and adversely affect the urban economy. If we don't pay enough attention to this problem in the process of river regulation and can't effectively control the preservation rate of the surrounding environment of the river, it will cause a vicious circle and seriously affect the development of the city.

2.2 the principle of river regulation

Rivers are important carriers of water resources. River regulation should meet the needs of biodiversity and provide a favorable living environment for amphibians and aquatic animals and plants, which not only protects the water ecological environment of the river, but also benefits the self-purification ability of the river. Considering the whole river management from the aspects of economy, society, ecology and humanities, it is necessary to meet the living conditions of human beings and to have the function of repairing natural rivers.

2.2. 1 Principle of plain river regulation. In the process of river regulation in plain areas, it is necessary to meet the standards of water system protection and ensure that the natural recovery capacity of rivers is not destroyed. Therefore, in the process of regulation, the regulation should be carried out according to the principles of normal flood discharge, bank slope stability, natural materials, cost economy, surface heterogeneity and internal and external water permeability, which can not only ensure the naturalness of the river to the maximum extent, but also meet the needs of human beings. This can not only minimize the impact on the velocity, discharge, environmental features and the balance of erosion and deposition, but also protect the natural ecological environment around the river to the maximum extent.

2.2.2 Principles of river regulation in mountainous areas. To harness the mountain rivers, it is necessary to make a detailed investigation on the whole mountain rivers, comprehensively grasp the relationship between the upper and lower reaches of the rivers and the whole basin, and comprehensively harness them according to the actual situation. We should follow the laws of nature and give full play to the functions of natural rivers. Therefore, in the actual control process, it is necessary to protect water and soil resources, take measures such as returning farmland to forests and closing mountains to facilitate afforestation, and minimize the inflow of sediment into rivers. At the same time, in the process of river regulation, it is necessary to build a certain dam in the upper reaches of the river to prevent the inflow of sediment, channel the downstream river and keep the river unblocked. The ecological balance around the river should strictly follow the laws of nature and try not to change the natural characteristics of the river to protect the natural river.

2.3 Pollution source control and water quality improvement

Measures to improve river water quality are an important link to repair the whole river ecosystem. In the process of water quality improvement, we should strictly abide by the relevant systems and strictly control the flow of production and domestic sewage into the river to ensure the success of river water quality improvement and achieve good results.

Rivers with serious water pollution must be treated at the source to control point source and non-point source pollution, and the purpose of reducing river pollution can be achieved by removing river silt, keeping the water surface clean, effectively controlling pollutants from entering the river, and adopting the method of rainwater and sewage diversion and drainage. It is necessary to conduct real-time monitoring of each river section and strictly control the sewage flow that must be discharged. When necessary, stricter discharge standards should be implemented, that is, advanced treatment measures should be taken for rivers. If it is possible to discharge toxic substances, and such substances are easy to accumulate, decisive measures should be taken to prevent toxic substances from entering rivers. In the process of regulation, according to the self-purification characteristics of the river, a reasonable sewage discharge plan, including the location of the sewage outlet and the time of sewage discharge, is formulated, and the environmental capacity of the water body is rationally utilized according to the actual situation on site to gradually improve the water quality of the river.

2.4 Study on Ecological Restoration Methods of Rivers

In order to protect the natural environment of rivers from being destroyed, according to the principle of river management, some suggestions for reference are put forward for the restoration of river ecological environment, so as to achieve the purpose of river management and ecological restoration. Dismantle some old weirs and dams, transform the gentle slope or low slope into falling water, control the change of river bed and restore the continuity of river water supply; Throw sandbags or boulders into the river, artificially create gullies and shoals in Kawachibe, and restore the multi-directional flow of the river; Transform the flowing space of the river to increase its flowing space as much as possible, so as to improve the flood control and waterlogging prevention ability of the river.

3 Conclusion

Water is an important resource for human survival and an indispensable factor for the development of human civilization. As an important carrier of water, rivers play an indelible role in the development of human society. In the past few decades, in order to achieve rapid development, human beings have neglected the river as an important resource, which has caused great damage to the ecological environment of the river and further restricted the economic development. People began to realize the importance of river regulation and ecological environment restoration. However, river regulation and ecological restoration cannot be achieved overnight. It requires us to persevere, constantly explore more effective new measures, and strive to create a new situation in which economic growth and environmental protection go hand in hand, complement each other and develop together.