Method for calculating ecological water demands in urban rivers and lakes

Abstract

The invention relates to a method for calculating ecological water demands in urban rivers, lakes and belongs to the technical field of ecological treatment of rivers and can be applied to the fieldsof water environment treatment and ecological environment protection. The method depends on the requirement of barrage construction engineering in urban water system building process, certain stable river width and reservoir capacity are formed after water hamming, and rivers are mainly characterized by problems such as small river confluence area, insufficient incoming river water, non-uniform spatial and temporal distribution of water resources, low water pollution carrying capacity and weak ecological environment. In the aspect of ecological environment, the river ecological environment water demand refers to the minimum water quantity required for river ecological systems to improve the river ecological environment quality or maintain ecological environment quality to prevent further reduction and the minimum base flow accommodated by the ecological systems under the water quantity. In general, certain micro flows of rivers can be further guaranteed in combination with current water environment river construction on the basis that river evaporation leakage is guaranteed.

Description

technical field [0001] The invention relates to a method for calculating ecological water demand in urban rivers and lakes, belongs to the technical field of river ecological management, and can be applied in the fields of water environment management and ecological environmental protection. Background technique [0002] Water is the source of life on earth and the foundation of life systems. In 1988, the United Nations Educational, Scientific and Cultural Organization (UNESO) and the World Meteorological Organization (WMO) defined water resources as "water as a resource should be available or likely to be used, with sufficient quantity and reliable quality, and can be used to meet the needs of a certain place. The long-term supply of water sources in response to resource demands.” [1] In the past, people only paid attention to the development and research of domestic water and production water, but now with the deepening of the concept of sustainable development and the nee...

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Problems solved by technology

[0005] With the rise of urban water system connectivity, the trend of forming landscape rivers in cities is gradually expanding. In the process of constructing urban river ecological landscapes, on the one hand, it will be considered to set up falling water barrages, sluices, spurs and other facilities to form Yongshui patterns. Form a good ecological landscape effect. On the other hand, because the connection of the water system often breaks the original water catchment pattern, the river course cannot be analyzed and calculated according to the natural river course.

Especially when the scale of the urban river is small and the confluence area is small, according to the hydrological calculation method, the runoff analysis results are very small, and the expected effect of the ecological landscape cannot be achieved; at the same time, according to the hydraulic calculation method, the river channel The amount of ecological water is often calculated to be relatively large. Under the current shortage of water resources, it is impossible to really get water replenishment and satisfaction.

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