湖泊富营养化评价模糊集理论与模式

根据湖泊(水库)营养化具有模糊性的特点。建立了湖泊(水库)富营养化评价的模糊集理论与模式,并首次提出富营养化指标综合权重矩阵概念及其确定方法。应用该模式对我国12个湖泊(水库)的富营养化程度进行了评价,结论与实际情况相符。为湖泊(水库)富营养化治理和保护提供了科学依据。上述理论与模型原则上亦可在其他环境评价领域中应用。     

生态系统健康评价软件的设计与实现

本文采用AHP(层次分析法)-Fuzzy(模糊综合评价法)相结合的方法设计实现了生态系统健康评价软件,在软件中将二者进行了算法实现,并结合GIS的地理空间分析功能将AHP-Fuzzy对生态系统健康评价的运算结果可视化。并利用锡林浩特地区的草地生态系统健康状况的若干野外调研数据对该软件的功能实现进行了验证,结果表明生态系统健康评价软件的设计与实现满足草地管理和决策人员的需要,该软件可以实现对单个指标的评价或几个指标组合的评价,是一个评价生态系统健康的很好平台。     

Fuzzy logic control of bridge structures using intelligent semi-active seismic isolation systems

Passive supplemental damping in a seismically isolated structure provides the necessary energy dissipation to limit the isolation system displacement. However, damper forces can become quite large as the passive damping level is increased, resulting in the requirement to transfer large forces at the damper connections to the structure which may be particularly difficult to accommodate in retrofit applications. One method to limit the level of damping force while simultaneously controlling the isolation system displacement is to utilize an intelligent hybrid isolation system containing semi-active dampers in which the damping coeffic ient can be modulated. The effectiveness of such a hybrid seismic isolation system for earthquake hazard mitigation is investigated in this paper. The system is examined through an analytical and computational study of the seismic response of a bridge structure containing a hybrid isolation system consisting of elastomeric bearings and semi-active dampers. Control algorithms for operation of the semi-active dampers are developed based on fuzzy logic control theory. Practical limits on the response of the isolation system are considered and utilized in the evaluation of the control algorithms. The results of the study show that both passive and semi-active hybrid seismic isolation systems consisting of combined base isolation bearings and supplemental energy dissipation devices can be beneficial in reducing the seismic response of structures. These hybrid systems may prevent or significantly reduce structural damage during a seismic event. Furthermore, it is shown that intelligent semi-active seismic isolation systems are capable of controlling the peak deck displacement of bridges, and thus reducing the required length of expansion joints, while simultaneously limiting peak damper forces. Copyright © 1999 John Wiley & Sons, Ltd.     

Spatial analysis of groundwater quality for drinking purpose in Sirjan Plain,Iran by fuzzy logic in GIS

At present,due to shortage of water resources,especially in arid and semiarid areas of the world such as Iran,exploitation of groundwater resources with suitable quality for drinking is of high importance.In this regard,contamination of groundwater resources to heavy metals,especially arsenic,is one of the most important hazards that threaten human health.The present study aims to develop an approach for presenting the groundwater quality of Sirjan city in Kerman Province,based on modern tools of spatial zoning in the GIS environment and a fuzzy approach of evaluating drinking water in accordance with the standards of world health organization(WHO).For this purpose,qualitative data related to 22 exploitation wells recorded during 2002 to 2017 were used.In addition,fuzzy aggregate maps were prepared in two scenarios by neglecting and considering arsenic presence in groundwater resources.The results showed a decrease in groundwater quality over time.More specifically,neglecting the presence of arsenic,in 2002,all drinking wells in the area were located in an excellent zone,while in 2017 a number of operation wells were located in the good and medium zone.Also,the final map,considering the presence of arsenic as a limiting factor of drinking water,indicated that parts of the southern regions of the plain would be the best place to dig wells for drinking water.Therefore,the use of new methods can contribute significantly to the usage of groundwater aquifers and provide a good view of the aquifer water quality.     

基于对象诊断的空间检验方法（MODE）

基于对象诊断的空间检验方法 MODE(Method for Object-Based Diagnostic Evaluation),通过在空间场中识别对象,计算对象的相似度,并最终形成两个场的综合相似度来实现对两个空间场的检验。相对于传统的点对点的检验方法,该方法综合考虑了空间位置、形状、面积等多种因素,并通过符合主观判断的模糊逻辑算法计算相似度,克服了数值预报传统检验方法对于空间位置的过度依赖以及TS评分中的"双重惩罚"等不足。个例研究表明该方法具有明显的优势,有较高的实际应用价值。     

一次东北冷涡天气过程双偏振雷达降水粒子相态识别

本文利用双偏振天气雷达资料，对2019年6月7-9日辽宁地区一次东北冷涡强对流天气过程进行分析。分析了东北冷涡的演变过程以及双偏振雷达的偏振参量在降水粒子相态识别中的作用，研究了不同判别规则对模糊逻辑算法识别结果的影响。结果表明：双偏振雷达的偏振参量可以对水凝物的种类、空间分布、物理形态进行大致判断，但水凝物相态识别结果仍需细化。模糊逻辑算法在强回波区域的识别结果更准确，采用不同的判别规则得到的水凝物分类结果虽存在一定差异，但在大部分观测区域的分类结果基本一致，符合天气演变规律，能够为气象预报预警提供鉴别参考。具有广泛时间、空间适配性的模糊逻辑算法，仍需大量实测案例数据的验证与仿真。     

基于层次分析法和模糊评判法的西藏国家气象公园评价研究

本研究依据中国气象局发布的国家气象公园评价指标体系充分考虑高原文化特色, 采用层次分析法(AHP)构建了适用于高原的气象公园评价体系。结果表明: 在准则层中, 天气景观＞人文气象景观＞环境保护＞科学性, 权重值分别为45.94%、32.48%、14.91%、6.67%, 在因子层中, 稀有度＞人文价值＞气候特征＞科学性, 权重值依次为25.80%、17.20%、9.70%、5.00%。在此基础上, 对纳木措、羊卓雍措、玛旁雍措进行模糊综合评价分析表明, 纳木措各因素综合评价为优, 羊卓雍措各因素综合评价为良, 玛旁雍措各因素综合评价为良。因此, 在经济条件有限的基础上, 认为纳木措建设成为国家气象公园是最优选择。本研究结果可为环境规划等相关部门和行业提供决策参考。     

基于信息扩散原理的渤、黄海沿岸风暴潮灾害风险分析

根据收集的渤、黄海沿岸主要海洋站(塘沽、羊角沟、烟台、威海、乳山口、青岛和日照)1950年以来各年最高潮位资料(个别站位资料样本较小),应用能优化处理小样本的基于信息扩散原理的模糊风险评估模型,对渤、黄海沿岸各海洋站年最高潮位的多年一遇极值情况进行了超越概率计算,并与《港口工程技术规范》推荐的极值I型(Gumbel曲线)方法进行比较。除羊角沟站误差3%外,其它站误差均在2%及以下,表明文中基于信息扩散原理的风险评估模型在兼顾小样本条件下所给结果是比较可靠的。这对于潮位等水文实测资料短缺的新建或拟建工程区进行工程水文要素设计重现期的推算将有较好的帮助。