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In order to objectively analyze the situation of spatial matching and carrying capacity of water resources in Henan Province, this paper evaluated the situation of spatial matching and carrying capacity of water resources in Henan Province from 2012 to 2021 by constructing Lorentz curve, improving mutation series model and mature-element extension model based on the data of total water resources and population, and used obstacle degree model to diagnose the main factors affecting the carrying capacity. At the same time, based on the water resources situation and the planned annual supply and demand of Henan Province, the multi-objective optimal allocation model of water resources was constructed. The results show that the spatial distribution of water-irrigated area and water-population is in equilibrium, while the spatial equilibrium of water-secondary industry production value and water-green coverage area is poor. From 2012 to 2021, the overall water resources carrying capacity of Henan Province is gradually increased, and the evaluation comprehensive value is increased steadily. The carrying capacity of water resources in Henan Province is mainly affected by natural population growth rate, industrial water consumption, population density, surface water resources, water production modulus and annual average precipitation. Water resources allocation can be divided into five water allocation schemes, and different schemes have different water use benefits, which can provide reference for regional water allocation [ABSTRACT FROM AUTHOR]

In order to fully understand the carrying capacity of water resources in Henan Province and promote the coordinated development between the development and utilization of water resources and the social economy, based on the actual situation of Henan Province, 18 indicators were selected to built an evaluation system among the four subsystems of society, economy, water resources and ecological environment. According to the relevant data of water resources in Henan Province from 2005 to 2020, the interval analytic hierarchy process (IAHP) and improved coefficient of variation method (ICVM) were combined to assign weights, and the comprehensive index evaluation model was used to analyze the carrying capacity of water resources in Henan Province. The analysis results show that the water resources carrying capacity fluctuates but tends to be stable from 2005 to 2020. The average comprehensive score of water resources carrying capacity is 0.416, and the average level of carrying capacity is “medium”. The M-K trend test shows that the water resources carrying capacity is on the rise, and it is predicted that the water resources carrying capacity of Henan Province will continue to maintain the “medium” grade and may reach the “higher” grade in the next few years. At the same time, the obstacle degree analysis shows that sewage discharge, per capita water consumption, groundwater supply proportion, ammonia nitrogen emission, chemical oxygen demand emission, total water resources, natural population growth rate and per capita GDP are the main obstacle factors of water resources carrying capacity in Henan Province. In the future, Henan Province may improve water resources carrying capacity by strengthening water resources protection and rational allocation of water resources. [ABSTRACT FROM AUTHOR]

This paper analyzed and summarized the equipment selection, reference station location and communication scheme of GNSS de formation monitoring automation system of Huangjinxia Hydro Junction project. It pointed out that on the basis of absorbing the experience and relevant research of GNSS system of similar projects in China, the system adopted GPS / BDS / GLONASS multi satellite data hybrid solution and double baseline adjustment to make the slope monitoring station watch the stars when the cut-off angle is large, the observation accuracy can meet the accuracy requirements of the specification for the first grade slope. Through the implementation of GNSS deformation monitoring automation system, we can timely grasp the deformation law of slope, predict the possible change range and trend of slope and landslide and take corresponding treatment measures in time, so as to provide technical guarantee and basis for the safety production of Huangjinxia Hydro Junction Project during the construction period. [ABSTRACT FROM AUTHOR]

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Comparing to ordinary rectangular labyrinth, the vertical channel was added two internal tooth and transverse channel was added one internal tooth respectively for forming four double inner teeth rectangular labyrinth channels with different position of inner tooth. The ordinary rectangular labyrinth channels and teeth double inner teeth rectangular labyrinth channels had the same minimum flow cross section, in order to study the hydraulic performance all of them. And the method of numerical simulation and orthogonal test were used to select the primary factors of inner tooth spacing, relative position and tooth height. Through variance analysis and range analysis, the main factors and secondary factors affecting the hydraulic performance were found. Finally the optimal scheme was got. The results show that in the ordinary rectangular labyrinth with internal tooth, the effect of energy dissipation will be better and the flow index generally decreases from 11.18% to 18.01%; three factors’ influencing order of double inner tooth rectangle labyrinth channel is that the relative position of inner tooth > inner tooth height > the inner tooth spacing; the structure of double inner tooth rectangular labyrinth channel with the minimum flow index is that the left upper side and right lower side in vertical flow and the side without vortex in transverse vortex adds inner tooth. The tooth spacing is 0.5 mm, tooth height is 0.9 mm and the flow index is 0.500 6. [ABSTRACT FROM AUTHOR]