河道堤防设计高程的概率设计和风   总被引：1，自引：0，他引：1  

伍元  范子武  姜树海 《中国农村水利水电》2005,(4):14-17

介绍河道堤防设计高程的概率和风险校核方法。该方法综合考虑多种不确定性因素的影响，利用随机微分方程推求河道水位的概率分布，并对风浪的随机影响进行分析，按照随机可靠性理论，对常规采用确定性方法确定的河道堤防高程进行漫顶风险校核和可靠性设计。  相似文献   

浙江省农业机械化水平的总体评价与地区比较     

舒伟军 《农机化研究》2007,(8):7-9,16

为科学评价农业机械化发展水平,在分析现有农业机械化水平评价方法的基础上,根据浙江省农业机械化发展现状及有关文献,建立和确定了浙江省农业机械化水平评价指标体系、评价标准以及各评价指标的权重;最后,利用2005年浙江省和其所属11个地(市)的有关统计数据计算出全省和各地区的农业机械化水平.评价结果表明,与实际情况基本一致,为加强农业机械化的宏观管理提供了科学依据.  相似文献   

我国北方地区节水农业技术水平及评价   总被引：15，自引：1，他引：15  

吴普特  冯浩  牛文全  高建恩  汪有科  范兴科 《灌溉排水学报》2003,22(1):26-30,34

在系统分析我国节水农业技术水平现状的基础上 ,对各类节水技术的差距和存在问题进行了探讨 ,提出了各类技术亟待研究解决的若干重点问题。并指出建立以渠道防渗技术、管道输水技术及地面灌水技术为核心 ,符合国情的节水农业技术体系已迫在眉睫。  相似文献   

Creating and Consolidating Locally Managed Irrigation in Turkey: the National Perspective     

Mark Svendsen  D. Hammond Murray-Rust 《Irrigation and Drainage Systems》2001,15(4):355-371

The Turkish program of irrigationmanagement transfer has gained worldwidecelebrity for its speed and effectiveness. This paper describes the program brieflyand assesses its effectiveness from anational perspective. The assessmentincludes changes in staffing levels,operational costs, service fee levels, andcost recovery from farmers. A companionpaper examines impacts at the local leveland looks specifically at changes in systemperformance.  相似文献   

An integrated modelling toolbox for water resources assessment and management in highland catchments: Model description     

R.A. Letcher  B.F.W. Croke  A.J. Jakeman  W.S. Merritt 《Agricultural Systems》2006

Water and land resource competition and environmental degradation pose difficult questions for resource managers. In particular, the ensuing trade-offs between economic, environmental, and social factors and their spatiotemporal variability must be considered when implementing management policies. This paper describes an integrated modelling toolbox that has been developed for highland catchments – specifically the Mae Chaem catchment in Northern Thailand. This toolbox contains models of crop growth, erosion and rainfall-runoff, as well as household decision and socioeconomic impact models. The approach described advances and complements previous approaches by: considering more complex interactions between land-use decisions and the hydrological cycle; modelling household decisions based on uncertain expectations; and assessing impacts of changes not only on flows and household income, but also on subsistence production and erosion. An example of the types of trade-offs and scenarios that can be assessed using the integrated modelling toolbox is also presented. This demonstrates that for the scenarios presented, the magnitude and direction of impacts simulated by the model is not dependent on climate. Further testing of the model is demonstrated in a companion paper. Overall, the plausibility of the model is shown.  相似文献   

东港灌区运行状况综合评价研究   总被引：3，自引：0，他引：3  

马涛  迟道才  李松 《中国农村水利水电》2006,(11):14-16

在灌区续建配套与节水改造规划工作实施的基础上，拟建了一套合理的评价指标体系，利用层次分析法（AHP）确定评价指标的权重，建立了模糊综合评判（FCE）数学模型，并运用该模型对东港市的三个灌区的运行状况进行综合评价，评价结果与实际情况吻合良好。  相似文献   

基于模糊层次分析法的农产品加工企业风险评价研究   总被引：1，自引：0，他引：1  

王侃 《中国农机化》2006,(5):76-79

风险评价是风险管理的重要阶段,针对农产品加工企业特点,提出了一种基于模糊层次分析法的农产品加工企业风险评价方法。该方法初步解决了农产品加工企业风险管理中的关键问题——风险因素的识别。以某农产品加工公司为例,介绍了该方法的应用过程。  相似文献   

农村污染缓流水体的修复研究   总被引：2，自引：0，他引：2  

周小锋  田晖 《中国农村水利水电》2007,(5):43-45

农村缓流水体是维系乡村生态平衡的重要组成部分, 水质污染已成为国内乡村缓流水体普遍现状。讨论了农村缓流水体的污染成因，并以水生植物大漂为水体修复主体，进行了大漂的水体修复特性的试验，讨论了在可控条件下用大漂对缓流污染水体进行修复治理的植物修复技术及大漂在水体修复中可能带来的生态风险及其防范。  相似文献   

Self-Reported Injuries in Indoor Gym-Based Rock Climbers: A Retrospective Study of Predictors of Prolonged Injury and Seeking Medical Care     

《The Forestry Chronicle》2023,34(3):311-317

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Evaluation of Safety Measures at a Medical Summer Camp During the SARS-CoV-2 Pandemic     

《The Forestry Chronicle》2023,34(1):77-81

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