共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
长江是江苏名副其实的母亲河,每天为全省一半以上的人口提供饮用水800多万立方米,是省内27个城市集中式饮用水源地,全省约80%的生活用水和工业生产用水直接或间接取之于长江,长江江苏段还是国家南水北调东线工程的战略水源地和长江三角洲重要的湿地生态功能区。沿江开发中,只有不断加强沿江饮用水源地的管理和保护,才能支撑起江苏经济的可持续发展,确保社会的稳定,真正造福沿江人民。 相似文献
3.
4.
5.
本研究调查了松花江从松花湖至九站段沿岸排污情况,根据调查的93个排污口分布情况及江段特点,在该江段设置了14个监测断面,同时对各监测断面氨氮、总磷、CODMn、BOD5及溶解氧等水质因子进行枯水期、平水期、丰水期的水质监测,运用模糊评价法对监测结果进行评价。结果表明:松花江吉林市段存在一定程度的有机污染,局部断面未达到功能区标准。 相似文献
6.
7.
通过Spearman等级相关系数法对秦淮河入江段水体水质状况及趋势进行分析评价,并结合水污染状况对秦淮河入江段主要污染物入江通量进行计算。结果表明:①2007—2011年期间,秦淮新河入江段和外秦淮河入江段整体水质污染程度呈上升趋势,污染状况有所恶化;②2011年秦淮河入江总通量分别为氨氮5197.49 t/a、化学需氧量31770.52 t/a和总磷561.90 t/a;③对秦淮河入江通量贡献最大的主要支流是外秦淮河,其氨氮入江通量占总入江通量的93.7%,化学需氧量入江通量占总入江通量的97.7%;④秦淮河水体入江后势必会给秦淮河入江段上下游的饮用水源区的供水安全带来隐患,影响长江农业用水、渔业用水功能的正常发挥,造成部分区域水资源水质性短缺。 相似文献
8.
近年来,受上游客水和辖区内城市生活污水、工业废水排放的影响,安徽省宿州市河流污染事故时有发生。为保障人民群众生活、生产用水安全,防止水污染事故的发生,环保、水利及农业等三家职能部门决定全面加强协作,并于日前共同下发了《关于建立水污染事故预警制度的通知》。通知要求,各县区环保部门要加强工业污染源监控,严禁超标排污行为的发生;准确掌握各排污口废水流量、主要污染物浓度及 相似文献
9.
10.
11.
应用博弈论的方法,探讨水源地、城市及用水者等相关利益主体在不同决策模式下的行为方式,分析了“用水者各自决策”“城市政府主导分配”“市场交易”和“政府调控下的市场配置”4种水源地水资源分配模式,认为“政府调控下的市场配置”是相对最优模式。探讨了跨境水源地权利保护机制、用水总量控制政策背景下的水源地水资源分配、水源地水权交易和生态补偿等相关政策问题,并提出相关政策建议。 相似文献
12.
13.
从水量安全、水质安全和管理安全3个方面遴选出9个指标,构建水源地安全保障达标评价指标体系和分级标准;针对PP模型在实际应用中最佳投影方向a难以确定的不足,利用一种全新的仿生群体智能算法——群居蜘蛛优化(SSO)算法搜寻PP模型最佳投影方向a,提出SSO-PP评价模型,通过5个高维复杂函数对SSO算法进行验证,并与粒子群优化(PSO)算法进行对比;利用SSO-PP模型对实例进行达标评价。结果表明:SSO算法具有较好的收敛精度和全局寻优能力,将SSO算法用于PP模型最佳投影方向a的选取,可有效提高PP模型评价精度。SSO-PP模型对暮底河水源地2010年、2015年达标评价结果为"基本达标"和"达标",2020年、2030年达标评价结果为"理想"。 相似文献
14.
15.
中国9大流域动态水资源影子价格计算研究 总被引:3,自引:0,他引:3
提出了一种非线性动态投入产出优化模型来计算水资源的影子价格,给出了中国水资源影子价格计算模型的计算方法和求解过程,并应用1999年中国33部门9大流域水利投入占用产出表的基础数据推算1949~2050年重要年份的水资源影子价格。 相似文献
16.
W.G.V. Balchin 《Land use policy》1984,1(1):4-13
The article outlines the various ways of conducting land use surveys. A detailed historical account of the development from topographical survey is given and the various stages in the process are outlined and assessed. The three methods currently in use — ground survey, air survey and satellite survey — are carefully analysed. The ways in which recent rapid technological change has already affected the science of land use survey are emphasized, along with the various exciting possibilities currently under investigation; several limitations of even the most advanced methods are however pointed out, as no single method would appear totally satisfactory in isolation from all other available methods. 相似文献
17.
This article focuses on adoption and modification decisions on improved maize storage technologies in southern Benin. Modification implies changing a technology to adapt to farmers' circumstances. A sample selection framework is used to account for selectivity bias as some farmers were not aware of the new technologies. Using this framework, the study investigates the effect of alternative information sources on adoption and modification decisions. Farmers are either informed by extension agents or by other farmers. The empirical results show that there are differences in adoption and modification decisions between these two groups. 相似文献
18.
19.
20.
The purpose of this paper is to calculate the value of stochastic carbon sequestration in climate change mitigation when also carbon dioxide emissions from fossil fuels and abatement costs are stochastic. The replacement cost method is used where the value of carbon sink is calculated as associated cost savings from replacement of more expensive mitigation options for achieving a given emission target. Minimum costs with and without carbon sinks are derived with a safety-first approach in a chance constrained programming framework which also accounts for variability in control costs. The theoretical results show that for high enough risk discount, carbon sink is not included in a cost effective mitigation program even when the carbon sink cost is zero. The empirical application to the EU independent commitment of 20% reduction in carbon dioxides shows large variation in carbon sink value depending on risk discount. Under no uncertainty, the value can correspond to 0.33% of total GDP in EU, but it declines due to the uncertainty associated with forest carbon sink and is zero for high probability levels in achieving the target. Thus, whether or not to recommend the inclusion of carbon sink in the EU climate policy depends on the uncertainty of carbon sinks in relation to other sources and on the importance of reaching stipulated emission reduction targets. 相似文献