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As an important indicator and basis for early warning of drought, water shortages, and anti- drought planning in water conservancy projects, the drought-limited water level (DLWL) plays an important role in scientific guidance of the drought control of lakes. This study focused on the characteristics of controlled water supply lakes, while also fully considering the ecological health and stability of the lakes and combining with the reverse recursive calculation of lake utilization regulation. Thus, we developed a method for calculating the DLWL of controlled water supply lakes. The rationality of this method was verified through a case analysis of Erhai Lake, Yunnan Province, China. The results showed that the severe water shortage in drought years can be alleviated effectively by setting the DLWL and considering the minimum ecological demand of the lake. The maximum reduction in water shortage for the water supply of the region surrounding Erhai is as high as 10. 23 million m 3, and the maximum reduction in agricultural irrigation water from Erhai entering Binchuan County is as high as 10. 16 million m 3 . Additionally, the water shortage rate and period in each industrial sector can be reduced significantly in areas around the lake. The time period during which the lake is below the ecological water level can also be reduced significantly. After setting the DLWL, the number of severe water shortage months for lake water supply and the Erhai water entering Binchuan County irrigation was reduced by 11 and 10 months, respectively, and the duration time below the ecological water level was reduced by 15 days. This study provides a general algorithm that can be used by flood and drought disaster prevention departments to establish a DLWL and guide the drought-relief operation of a lake, which can provide the scientific basis and technical support required for drought prevention. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

Drought-limited water level (DLWL) is an important indicator for early warning against droughts and can be used to guide the drought-relief operation at reservoirs. This study aims to build a determination algorithm to specify the DLWL for different types of reservoirs. We define the DLWL of a reservoir as the water level at which the water supply system reaches the critical point of drought and water shortage. By introducing the double layer of operation and guarantee periods as control parameters, a general algorithm for DLWL suitable for multi-year, annual, and seasonal regulation of reservoirs is proposed, which is used to form a reservoir drought-resistant operation strategy. The Zhangfeng Reservoir and Hechuan Reservoir were used to verify the feasibility and rationality of the double-layer sliding algorithm for the multi-year and seasonal regulation of reservoirs, respectively. The results show that by setting the DLWL, the serious water shortage in drought years can be effectively alleviated; the water shortage rate and period in each industrial sector can be significantly reduced. This study provides a general algorithm to the flood and drought disaster prevention department to set a DLWL and guide the drought-relief operation of the reservoir, which can provide the scientific basis and technical support required for drought prevention. [ABSTRACT FROM AUTHOR]

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Copyright of Yellow River is the property of Editorial Board of Yellow River and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Advances in Water Science / Shuikexue Jinzhan is the property of Editorial Board of Advances in Water Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)