Development of Land Resources in Transitional Zones Based on Ecological Security Pattern: A Case Study in China     

Peng  Wenfu  Zhou  Jieming 《Natural Resources Research》2018,28(1):43-60

Land use based on landscape ecological security pattern provides a scientific basis for alleviating conflicts between land conservation and human use, ensuring concomitant economic development and ecological integrity. The majority of studies by Chinese researchers have been focused on the carrying capacity and land development intensity, and less attention has been paid to the ecological security pattern of the landscape in Mianzhu in the transitional zone between the Chengdu Plain region and the Longmen Mountains, western China. However, land resources are undergoing significant changes resulting from land use associated with rapid economic development and demographic growth. In this study, we constructed a minimum cumulative resistance model in Mianzhu in the transitional zone, and the land space was divided into optimized development areas, key development areas, restricted development areas, and prohibited development areas according to the landscape ecological security pattern based on the model surface. These land use types covered 7218.39 ha, 17,974.75 ha, 21,545.39 ha, and 77,791.46 ha, respectively. We also examined land use changes over the last 20 years and quantitatively analyzed the relationships between land use changes and geographic factors based on remote sensing and geographic information system. The information obtained from this research ultimately impacts future policies and plans regarding land resources and can be used to promote the sustainable use of land resources in the region.

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Complexity analysis of rainfall and runoff time series based on sample entropy in different temporal scales   总被引：5，自引：3，他引：2  

Chien-Ming Chou 《Stochastic Environmental Research and Risk Assessment (SERRA)》2014,28(6):1401-1408

This study applied sample entropy (SampEn) to rainfall and runoff time series to investigate the complexity of different temporal scales. Rainfall and runoff time series with intervals of 1, 10, 30, 90, and 365 days for the Wu-Tu upstream watershed were used. Thereafter, SampEn was computed for the five rainfall and runoff time series. The results show that for the various temporal scales, comparisons of the complexity between the rainfall and runoff time series based on the SampEn are inconsistent. Calculating the dynamic SampEn further elucidated variations of the complexity in the rainfall and runoff time series. In addition, the results show that SampEn measures of the rainfall and runoff time series are typically higher than the approximate entropy measures of the rainfall and runoff time series for a specific temporal scale. The complexity increases when the sample size increases for a specific temporal scale. Furthermore, temporal scales with low complexity and high predictability are obtained from the variations of SampEn for the rainfall and runoff time series with different temporal scales, thereby providing a reference for determining the appropriate temporal scale for rainfall and runoff time series forecasting.  相似文献   

A brief introduction to BNU-HESM1.0 and its earth surface temperature simulations     

Shili Yang  Wenjie Dong  Jieming Chou  Jinming Feng  Xiaodong Yan  Zhigang Wei  Wenping Yuan  Yan Guo  Yanli Tang  Jiacong Hu 《大气科学进展》2015,32(12):1683-1688

Integrated assessment models and coupled earth system models both have their limitations in understanding the interactions between human activity and the physical earth system. In this paper,a new human–earth system model,BNUHESM1.0,constructed by combining the economic and climate damage components of the Dynamic Integrated Model of Climate Change and Economy to the BNU-ESM model,is introduced. The ability of BNU-HESM1.0 in simulating the global CO2 concentration and surface temperature is also evaluated. We find that,compared to observation,BNU-HESM1.0underestimates the global CO2 concentration and its rising trend during 1965–2005,due to the uncertainty in the economic components. However,the surface temperature simulated by BNU-HESM1.0 is much closer to observation,resulting from the overestimates of surface temperature by the original BNU-ESM model. The uncertainty of BNU-ESM falls within the range of present earth system uncertainty,so it is the economic and climate damage component of BNU-HESM1.0 that needs to be improved through further study. However,the main purpose of this paper is to introduce a new approach to investigate the complex relationship between human activity and the earth system. It is hoped that it will inspire further ideas that prove valuable in guiding human activities appropriate for a sustainable future climate.  相似文献   

Customer concerns about uncertainty and willingness to pay in leasing solar power systems     

L. H. Shih  T. Y. Chou 《International Journal of Environmental Science and Technology》2011,8(3):523-532

Although solar power systems are considered as one of the most promising renewable energy sources, some uncertain factors as well as the high cost could be barriers which create customer resistance. Leasing instead of purchase, as one type of product service system, could be an option to reduce consumer concern on such issues. This study focuses on consumer concerns about uncertainty and willingness to pay for leasing solar power systems. Conjoint analysis method is used to find part worth utilities and estimate gaps of willingness to pay between attribute levels, including various leasing time lengths. The results show the part worth utilities and relative importance of four major attributes, including leasing time. Among concerns about uncertainties, government subsidy, electricity price, reliability, and rise of new generation solar power systems were found to be significantly related to the additional willingness-to-pay for a shorter leasing time. Cluster analysis is used to identify two groups standing for high and low concerns about uncertainty. People with more concerns tend to pay more for a shorter lease time.  相似文献   

基于时间序列雷达干涉测量的钱塘江海塘形变分析     

张云俊  万紫  谢酬  邵芸  袁名欢  陈武  王新 《遥感学报》2015,19(2):339-354

形变监测是海塘安全运行的重要组成部分。本文利用杭州地区2006年—2010年获取的31景EnvisatASAR影像,根据MTInSAR(Multi-Temporal In SAR)方法,综合提取PS(Persistent Scatterer)和DS(Distributed Scatterer)点,得到密集的钱塘江海塘形变的In SAR测量结果。与28个点的水准数据对比表明,两者的平均误差为0.436 mm,最大误差为5.016 mm,验证了In SAR技术毫米级的测量精度和准确性。通过这两种数据的时间序列分析发现,海塘的沉降在空间上具有连续性,其空间分布呈现为单峰下沉曲线;在时间上,则具有明显的线性变化规律,并伴随有短时间范围的小幅度波动。  相似文献   

Fractured-bedrock aquifer studies based on a descriptive statistics of well-logging data: A case study from the Dajia River basin,Taiwan     

Po-Yi Chou  Shih-Meng Hsu  Po-Jui Chen  Jung-Jun Lin  Hung-Chieh Lo 《Acta Geophysica》2014,62(3):564-584

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广州新型智慧城市应用探索:城乡规划的智慧化管理   总被引：1，自引：0，他引：1  

王建军  胡海  朱寿佳  杨杰明 《地理信息世界》2017,24(4)

新技术尤其是信息技术的快速发展为新型智慧城市的建设提供了条件,城市规划管理作为城市建设的前端环节,在新型智慧城市建设中发挥着重要的作用。规划管理"一张图"平台、多规合一信息联动平台等围绕新技术而形成的规划管理新手段,极大地提高政务效率,也倒逼新型智慧城市的规划管理更加智慧化。本文以广州市为例,分析城乡规划智慧化管理历程,从决策层、管理层、实施层、技术层和数据层5个维度探索城乡规划智慧化应用,构建城乡规划智慧化管理体系,关注智慧化提升城乡规划与管理能力,运用信息系统构建五年空间规划体系、一张图管理和实施评估、多源数据辅助规划决策等城乡规划智慧化方式,为相关城市建设新型智慧城市应用提供支撑。  相似文献   

Projections of severe droughts in future climate in Southeast Brazil: a case study in Southern Minas Gerais State,Brazil     

Silva  Vinicius Oliveira  de Mello  Carlos Rogério  Chou  Sin Chan 《Theoretical and Applied Climatology》2022,148(3-4):1289-1302

Theoretical and Applied Climatology - South of Minas Gerais state, in Southeast Brazil, is known for the coffee crop production (more than 30% of country’s production) and hydroelectricity...  相似文献   

Growth of Five Species of Gorgonians (Sub-Class Octocorallia) in the Sedimented Waters of Singapore     

N. K. C. Goh  L. M. Chou 《Marine Ecology》1995,16(4):337-346

Abstract. Annual growth rates of gorgonians in the Indo-Pacific region are reported ror the first tinie. A method of measuring gorgonian growth using periodic photographic monitoring that is sensitive to horizontal growth and changes in growth foci but that does not require tedious underwater measurements is applied. Growth parameters of five species of gorgonians from three Families ( Plexauridae. Melithaeidae . and Subergorgiidae ) were monitored over a period of 18 months using this method. Growth rates ranged from 2.30 cm a^-1 to 7.88 cm. a ^-1 in the highly sedimented waters of Singapore. The maximum number of branches added per year ranged from 1.7 to 14.5.  相似文献   

The use of acidimetric titration as a novel approach to study particulate trace metal speciation and mobility: Application to sediments of the Scheldt estuary     

J.C.J. Petit  M. Bouezmarni  N. RoevrosL. Chou 《Applied Geochemistry》2009

The study of trace metal speciation has benefited from a great deal of interest leading to the development and the diversification of sequential extraction schemes (SES), which triggered the need for harmonization by the standard, measurements and testing programme (SM & T). However, some uncertainties still persist in the application of the harmonized 3-step protocol, because of the difficulty in conceptualizing a technique that can be applied to environmental samples irrespective of their nature. The alternative method proposed in this study is based on the solubility of the sample components progressively dissolved during the course of an acidimetric titration by 1 mol L⁻¹ HCl. The major HCl-reactive mineralogical components are identified using mass balance calculation of H⁺ consumed by their dissolution together with the amount of major elements released into solution. The speciation of minor and trace elements is investigated by comparing their titrations to those of the major elements. This approach is much simpler than SES because it uses simple non-selective H⁺ at room temperature instead of a complex experimental design of so-called specific reagents. The different mineral components of the solid are no longer operationally defined and the problem of selectivity is irrelevant to the titration approach. The method was applied to several sediment samples from the Scheldt estuary and the particulate phase was further examined by Scanning Electron Microprobe and X-ray Diffraction techniques. The nearly complete consumption of H⁺ in the suspension is balanced by the total dissolution of carbonates and Fe-oxyhydroxides. In contrast to the speciation inferred from the Tessier SES, the acidimetric titration has demonstrated that the carbonate phase does not significantly contain trace metals with the exceptions of 40% of the Mn and 30% of the Co. In contrast, the Fe-oxyhydroxides seem to play a major role and account for 70% of Pb and 20% of Cr, in addition to 60% of P and additional amounts of 20% Co and 40% Mn. 70% of the Cu also occur in the oxyhydroxide phase, more likely coprecipitated with gibbsite. 90% of the Cd and 85% of Zn can be attributed to the Acid Volatile Sulfide (AVS) phase as evidenced from S titration. The acidimetric titration method not only provides information on the speciation of trace metals but also allows the quantification of their reactivity and mobility, if one considers that the titration roughly mimics pH changes that may occur as a result of chemical disequilibrium in the environment. The results demonstrate the potential of the acidimetric titration as an alternative to SES protocols in geochemical and environmental regulation studies. This method is applicable to a wide variety of environmental materials with little or minor adjustments.  相似文献