Construction Technology And Application Of River Imitating Natural Habitat Based On Deep Shoal

In recent years,with the rapid development of urbanization,the rivers in the city begin to build artificial bank protection,build dams for hydroelectric power generation,and destroy the original ecosystem of the river,resulting in the decline of river water quality index.Biodiversity has been reduced and the ecological environment has been damaged.Through the research on the theory and technology of river imitating natural habitat and the analysis of practical application effect,it is of great significance for the management and development of urban river in the future to provide technical support for ecological restoration and habitat construction of urban river.In this paper,the water quality and biodiversity of Benxi section of Taizi River are measured and analyzed by investigating the urban section of Taizi River on the spot.Based on the test data,the water ecosystem health evaluation of Benxi section of Taizi River was carried out,and the basic condition of water ecosystem in Benxi section of Taizi River was preliminarily understood.Then the artificial simulation river was used to carry out a pilot trial,and the tributaries of the princeling river were tested,and finally the demonstration project was completed,and the habitat was started to be constructed.The results are as follows:(1)based on the health evaluation of river water ecosystem in Benxi section of Taizi River,it is known that the water quality of Benxi section of Taizi River is general.The indexes of macrobenthic algae and macrobenthos are poor,especially in the middle and lower reaches of Benxi section of Taizi River.Due to artificial revetment and sewage discharge from factories,the habitat condition is poor and some ecosystem functions are degraded.It is urgent for us to carry out river regulation and ecological restoration in Benxi urban section of Taizi River.(2)this paper finds out that the increment of dissolved oxygen in water is related to the initial concentration of dissolved oxygen.The lower the initial dissolved oxygen concentration,the larger the dissolved oxygen increment after the combination process.Using the combined technology of dike,submersible dam,falling water and deep pool shoal to reoxygenate,the effect is obvious.(3)A pilot study of Taizi River shows that the reoxygenation effect of a single spur dam,Shuangding submersible dam and deep pool shoal is poor,and it cannot cause a lasting effect on dissolved oxygen in the river.Using combination dike,combination Shuangding submersible dam and combined deep pool shoal to reoxygenate the river,the effect is better,and the continuity is high,which is beneficial to the river habitat construction.(4)demonstration project construction is carried out on the Cheng River in the Taizi River and under the block dam on the Tuanshang River.After a period of natural recovery,the concentration of dissolved oxygen in rivers has increased significantly,and the species and quantity of living plants in rivers have increased obviously,and the ecological environment has been improved Good,achieved the desired effect.