Abstract:Seasonal rivers with drastic elevation differences commonly suffer from severe baseflow shortages and frequent river channel desiccation during non-flood seasons. Traditional hard diversion projects are prone to disrupting the hydrological connectivity of river channels and damaging the ecological habitats along the water. Aiming at the above treatment bottlenecks, taking the Qingdao Zhangcun River (Laoshan Section) Ecological Restoration Project as a research example, a coordinated regulation technology for retaining dams and ecological water storage suitable for seasonal river channels is proposed. By systematically analyzing the hydrodynamic evolution, hydrological regimes and topographic elevation variation characteristics across different river reaches, a multi-dimensional integrated ecological water storage regulation system is established, and the multi-level waterfront vegetation space for conservation is supplemented to enhance the capacity for soil and water conservation and water source regulation and storage. The engineering practice shows that this technical system can effectively solve the problem of water shortage and water drying in rivers during non-flood seasons, maintain the regular and stable ecological water surface of the river and restore the natural ecological texture of the river, which provides reliable engineering references and technical guidance for the ecological governance, hydrological restoration and waterfront spaces improvement of similar seasonal urban rivers with drastic elevation differences in China.
