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George H. Nieswand Robert M. Hordon Theodore B. Shelton Budd B. Chavooshian Steven Blarr 《Journal of the American Water Resources Association》1990,26(6):959-966
ABSTRACT: Buffer strips are undisturbed, naturally vegetated zones around water supply reservoirs and their tributaries that are a recognized and integral aspect of watershed management. These strips can be very effective in protecting the quality of public potable water supply reservoirs by removing sediment and associated pollutants, reducing bank erosion, and displacing activities from the water's edge that represent potential sources of nonpoint source pollutant generation. As part of a comprehensive watershed management protect for the State of New Jersey, a parameter-based buffer strip model was developed for application to all watersheds above water supply intakes or reservoirs. Input requirements for the model include a combination of slope, width, and time of travel. The application of the model to a watershed in New Jersey with a recommended buffer strip width that ranges from 50 to 300 feet, depending upon a number of assumptions, results in from 6 to 13 percent of the watershed above the reservoir being occupied by the buffer. 相似文献
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以S-O-R理论为框架,结合感知互动性理论与价值理论,构建旅游网站中旅游经历分享行为的研究模型。结果表明:①用户在使用旅游网站过程中的感知互动性正向影响其对该网站信息价值的感知程度、自我呈现的满足程度和社会认同的满足程度。②用户对旅游网站的感知互动性会通过社会认同的满足促进用户的分享行为。③用户对旅游网站的感知互动性会通过信息价值感知和社会认同满足促进用户的分享意愿,而用户的分享意愿正向影响其分享行为。 相似文献
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《Journal of Environmental Planning and Management》2012,55(6):733-752
We use Finnish data to estimate the extent of the recreation benefits obtained from visits to second homes. Special emphasis is placed on how environmental attributes of second homes influence the recreation value of visits. The impacts are valued using the travel cost method. We estimate the recreation value to be about approximately €170– 205 per trip. The aggregate non-market benefits of the use of the current summer home stock are considerable – approximately €500 million per annum. The presence of algae that prevent aquatic recreation decreases the value per trip by 40%, and the lack of a beach reduces it by 45%; electrification increases the value by 3–5%. These impacts should be balanced against the social costs of second homes when designing environmental policies on leisure-time housing. 相似文献
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交通运输网络可靠性研究分析 总被引:1,自引:0,他引:1
许良 《中国安全科学学报》2007,17(1):135-140
重点分析连通可靠性、出行时间可靠性、能力可靠性、行为可靠性和潜在可靠性等评价道路网络性能的指标,在回顾和总结交通网络可靠性研究发展的基础上,针对国内外的研究现状,提出了目前研究中存在的问题,描述了该领域有待研究的方向. 相似文献
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王建光 《中国安全科学学报》2022,32(6):151-156
为满足人们无障碍出行需求,从安全视角评价无障碍出行轨道交通环境,构建无障碍出行轨道交通环境的评价指标体系,应用熵权法(EWM)确定指标体系的权重,通过使用后评价(POE)视角,选取长春市907份数据样本,应用灰色关联分析(GRA)评价长春市无障碍出行轨道交通环境,采用多元归模型分析影响无障碍出行轨道交通环境建设的因素。结果表明:在无障碍出行的轨道交通环境建设中,最重要的指标包括无障碍设施引导性、工具的安全性、语音播报或提示牌、购票便利性、周围人对求助提供帮助的意愿等。影响无障碍出行满意度的因素包括无障碍设施的维护与保养、信息技术在无障碍设施中的应用等。 相似文献
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S. P. LoseeA. L. Brown 《环境科学学报(英文版)》1996,8(2):129-144
Usingstructuredsystemsanalysistodesignanintegratedsystemfortransportplanningandenvironmentalanalysis¥S.P.Losee;A.L.Brown(Facu... 相似文献
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Mihaela Dimitrova 《组织行为杂志》2020,41(4):369-383
As frequent travel across international borders has become common for an ever-increasing number of workers, it is essential to understand what helps these international business travelers (IBTs) thrive and embrace their global work responsibilities. This study's purpose is to examine the role of developmental opportunities (i.e., work role challenges) in helping IBTs see frequent travel as a predominantly beneficial experience. By integrating two theories of motivation—conservation of resources theory and the challenge-hindrance demands framework—I build a moderated mediation model of IBTs' intent to cease their global work responsibilities (i.e., global role turnover intentions). Using latent moderated structural equation modeling, I test the model on a sample of 204 IBTs collected at two time points. Results show that, through the psychological state of thriving at work, travel frequency has a negative indirect association with IBTs' global role turnover intentions when IBTs' work roles are challenging and a positive association when their work lacks challenge. This is primarily the case regarding the challenge of being responsible for others at work. The novelty of IBTs' work tasks is also a salient challenge but to a lesser extent. This study contributes to literatures on global work, work role design, and thriving. 相似文献