Evaluation of regional water resources capacity provides a scientific basis for further water resources utilization and social economic sustainable development. This paper mainly studied on the case of Lanzhou City located in the western China. By using the method of fuzzy comprehensive evaluation and basing on the historical datum of 40 years, this paper evaluated the current situation of water resource capacity in Lanzhou and its dynamic trend. The calculation of comprehensive evaluation matrix is confirmed on the nature of membership function, the dynamic trend of water resource capacity is forecasted as well after the police was putted in practice in the future. The results showed that the utilization of water resource in Lanzhou is unreasonable now. The water resources have been developed to a considerable scale, but the water carrying capacity decreased year by year. Basing on the study, this paper suggested that the system and model of developing and utilizing water resource, policy of using water, scientific policy of water price and paying policy of water resource, saving water and protecting solution society, as well as protecting engineering related with water resource should be built up step by step.

In order to promote the sustainable development of a social economy and ecology, the social–economic–natural compound ecosystem (SENCE) conceptual framework was used to construct the water environmental carrying capacity index system. Taking the Gansu section of the Yellow River basin as an example, 18 indexes were selected from the 3 subsystems of social, economic, and natural ecology. Based on the unascertained measure theory and the obstacle factor model, the comprehensive level of water environmental carrying capacity in the Gansu section of the Yellow River basin from 2015 to 2020 was empirically evaluated, and the obstacles that hindered the water environmental carrying capacity were identified and analyzed. The results showed that the comprehensive level of water environmental carrying capacity fluctuated and increased overall, and it was grade III (critical load) from 2015 to 2017 and in 2019 and grade IV (weak load) in 2018 and 2020. Considering the ranking of the obstacle degree of each index, the obstacle factors were concentrated in the natural ecological subsystem, among which the obstacle factors were the discharge of wastewater, the population density, the urbanization rate, and the water resources development and utilization rate, which should be examined in the future. The research results and methods described in this paper could provide a theoretical reference for the evaluation of water environmental carrying capacity for other rivers and lakes.

Yellow River ice is the most prominent and significant natural disaster in winter and spring in China. During the drift ice period, water transmission tunnels located in this area tend to be hit by water–drift ice coupling. Thus, it is an important issue to reduce water transmission tunnel damage by drift ice, ensure the safety of operation and maintenance, and prevent engineering failure. In this paper, a numerical simulation of the collision process between ice and the tunnel is carried out by using the fluid structure coupling method and ANSYS/LS-DYNA finite element software. In addition, a model test with a geometric scale of 1:10 is carried out to verify the numerical simulation results, and the mechanical properties and damage mechanism of drift ice impacting the tunnel concrete lining in water medium are studied. The results show the following: the experimental values of maximum equivalent stress and X-directional displacement of the flow ice on the water transfer tunnel have the same trend as the simulated values, both of which show an increasing trend with an increase in flow ice velocity. It is shown that the ice material model parameters, ALE algorithm, and grid size used in this paper are able to simulate the impact of drift ice on the water transfer tunnel more accurately. With an increase in drift ice collision angle and drift ice size, the fitted curves of equivalent stress and peak displacement in X-direction all show relationships of exponential function. The peak value of displacement in the X-direction and maximum equivalent stress decrease with an increase in the curvature of the tunnel structure. It is also shown that the influence of change in drift ice size on the tunnel lining is greater than that of a change in tunnel section form. It is found that a high-pressure field will be formed due to extrusion of flowing ice, which should be fully considered in the numerical simulation. The research method and results can provide technical reference and theoretical support for prevention and control of ice jam disasters in the Yellow River Basin.

In order to enhance the effectiveness of China’s water resources management, China has implemented the most stringent policies in recent years, such as the most stringent water resources management system, the full implementation of the “River Administrator” system, and the “Lake Administrator” system. In this article, we studied the water management systems of six foreign countries, including United States, Canada, Japan, the United of Kingdom, France, and Australia, with exploring and analyzing the operating modes of their management system, to summarize their distinct advantages and common problems, provide reference for the development and perfection of China’s water resources management system, and to better support the sustainable management of China’s water resources and water environment to support the sustainable economic development of the basin and strict water resources management systems and water Implementation of pollution prevention action plans.

It is helpful to improve the safety management level of enterprises to carry out the comprehensive evaluation on safety management of the road transport enterprises of dangerous goods, and to reduce road safety accidents. Based on the analysis of the risk factors of road transport of dangerous goods, this paper constructs a comprehensive evaluation index system for the safety of the road transport enterprise with the AHP method, and gives the weight of each evaluation index. Combined with the instance, the correlation size between each evaluated enterprise and the virtual “best enterprise” is calculated by using gray relational analysis model, so as to identify the pros and cons of the safety management level of each evaluated enterprise, and provide reference for comprehensive safety evaluation of road transportation enterprises of dangerous goods.