Based on system dynamics theory and method,the social economy-water resources-eco-environmental system dynamics model is developed.Taking water demand forecasting of the Northern Gulf Economic Zone in Guangxi Province for an example,the rationality of prediction results are analyzed.The results show that the total water demand of the Northern Gulf Economic Zone will be 13.782 billion m3 in 2015,15.568 billion m3 in 2020,and 17.808 billion m3 in 2030.System dynamics method is appropriate for middle and long-term water resources planning,which can comprehensively consider various influencing factors for forecasting water demand.
The process of depositing nanoparticles onto tapered fiber probes with the laser-induced chemical deposition method (LICDM) and the surface-enhanced Raman scattering (SERS) detection performance of the prepared probes are experimentally investigated in this paper. Our results show that the nanoparticle-deposited tapered fiber probes prepared with the LICDM method depend strongly on the value of the cone angle. For small-angle tapered probes the nanoparticle-deposited areas are only focused at the taper tips, because the taper surfaces are mainly covered by a relatively low-intensity evanescent field. By lengthening the reaction time or increasing the induced power or solution concentration, it is still possible to deposit nanoparticles on small-angle tapers with the light-scattering effect. With 4-aminothiophenol as the testing molecule, it was found that for given preparation conditions, the cone angles for the tapered probes with the highest SERS spectral intensities for different excitation laser powers are almost the same. However, such an optimal cone angle is determined by the combined effects of both the localized surface plasmon resonance strength and the transmission loss generated by the nanoparticles deposited.
This paper analyses the drivers and constraints for effective cross-sectoral collaboration in river basin management and the extent to which factors identified in related literature determine success or failure of collaboration in selected case studies. Cases selected were from industrialized and densely populated catchments, where trade offs across human activities are particularly intense. This article focuses on three sub-basins: one in the Dutch section of the Rhine; a second in the German section of the Rhine; and a third in China’s Zhujiang (Pearl River) basin. This selection, inspired by the work of the EU-China River Basin Management Programme (2007–2012), enabled a comparative analysis on two levels: (a) between the Chinese and the European sub-basins in order to better understand collaborative forms of management in two very different basin governance regimes; (b) between the two European cases in the Rhine in order to assess how collaborative arrangements vary within the same basin. Empirical work enquired into how cross-sectoral collaboration operates in key catchment management processes; what drivers lie behind collaboration initiatives; and whether obstacles hinder the emergence of collaboration. Our findings highlight various mechanisms through which the wider formal and informal institutional contexts, and processes of institutional interplay, influence more proximate factors identified in the literature. Furthermore, our research illustrates the central role that actor networks and the state play in initiating and sustaining collaboration in water management and river basin governance.
Abstract Under the guidance of the new water management idea of “water conservation priority, spatial balance, system management, and two-handed effort,” the National Water Conservation Action Plan released in 2019 puts forward the key task requirements of “double control of total intensity,” in which the effective utilization coefficient of irrigation water in farmland is one of the indicators of water intensity control. The effective utilization coefficient of irrigation water is one of the water intensity control indicators. At present, there are practical difficulties in measuring the effective utilization coefficient of irrigation water in farmland, such as the low measurement rate of water consumption in the current irrigation area, the high input equipment and manpower requirements, and the difficulty in accurately measuring the net irrigation water absorbed by crops. Therefore, this paper proposed the method of “field monitoring - remote sensing inversion - a comprehensive analysis of data.” The method of “field monitoring - remote sensing inversion - econometric model construction - comprehensive analysis” was proposed in this paper, which can obtain gross irrigation water utilizing field monitoring, overcome the difficulty of accurate monitoring of net irrigation water using remote sensing, and carried out a comprehensive analysis, to realize the scientific, effective and rapid calculation of effective utilization coefficient of irrigation water. This method was applied to the Meixian District, Guangdong Province, and the research results show that it not only generates reliable measurement data but also alleviates workload. Furthermore, it offers scientific measurement techniques for water use efficiency indicators, facilitating the achievement of “dual control over total volume and intensity.” This paper provides an important technical basis for the rational allocation of water consumption and scientific approval of water use plans and supports the assessment of the effectiveness of water-saving irrigation development and the reasonable evaluation of the water-saving potential of farmland irrigation, thus providing a basis for local government departments at all levels to make planning, scientific decision-making, and macro-management.
In this paper,the large-scale system decomposition coordination is applied to solve the problems of optimal allocation of water resources in reception basins about interbasin water transfers in Shandong province.The optimal model is established and solved by simulation technique in combination with optimization methods.The program diagrams of optimal decision arithmetic are posed.The problem many water resources,multi-purpose,multi-use and water supply multiprobability are solved.The research results can provide scientific basis for the similar problems.
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