江河断面分级分期旱限水位(流量)确定方法

An algorithm for grading and staged drought- limited water level (flow) of river sections

江河断面旱限水位(流量)是流域干旱预警的重要指标,可作为启动流域抗旱应急响应、指导水利工程开展抗旱调度的重要依据。本文针对江河断面旱限水位的相关概念和技术问题,完善了江河断面旱限水位(流量)的内涵,指出其是表征河流进入低枯状态即将产生社会经济与生态环境缺水风险的水位(流量)阈值。考虑不同干旱程度及干旱期用水规律,从分级分期的角度提出适用于不同类型河段的江河断面分级分期旱限水位(流量)确定方法。通过对渭河临潼断面和抚河廖家湾断面的实例应用,验证了算法对资源约束型和综合约束型断面的适用性和合理性。本研究为水旱灾害防御部门制定江河断面旱限水位(流量)提供了通用算法,能够为干旱预警决策提供科学依据和技术支撑。

The drought-limited water level(flow) of a river section is an important indicator of drought in the basin.This can be used as the key basis for starting an emergency response and guiding drought-relief dispatch in water conservancy projects.In this paper, with the aim to examine the related concepts and technical problems of the drought limit water level in the river section, the connotation of the drought limit water level(flow) of the river section is improved.It is the threshold that characterizes the dry state of the river, to determine the water shortage risk and its effect on the social economy and ecological environment.Considering the different degrees of drought and the laws on water use in drought periods, a method for determining the drought limit water level(flow) that is suitable for different types of river sections is proposed from the perspective of grading and staging.The applicability and sustainability of the algorithm for resource use and otherwise constrained river sections are verified with examples from the Lintong section of the Weihe River and the Liaojiawan section of the Fuhe River.This study provides a general algorithm to support flood and drought disaster prevention departments in setting drought limit water level(flow) in river sections and can provide a scientific basis and technical support for drought warning decision-making.