Urban renewal in East African port cities: Mombasa's Old Town waterfront   总被引：3，自引：0，他引：3  

Brian Hoyle 《GeoJournal》2001,53(2):183-197

The urban waterfront redevelopment diaspora, formerly confined to advanced countries, is starting to impact upon coastal settlements in former colonial territories. In diverse contexts ranging from postcolonialism and globalization to cultural revival and tourism development, developing countries are seeking to revive their historic port cities. This paper reports on the experience of Mombasa, Kenya, where waterfront redevelopment is a problematic element in the conservation of the historic urban core, and relates local issues to wider policies, relevant literature and experience elsewhere.  相似文献   

不同方案求解非线性化学动力学方程组的比较   总被引：1，自引：0，他引：1       下载免费PDF全文

王体健  李宗恺 《应用气象学报》1996,7(4):466-472

在一个简化的气相化学模式的基础上，比较了Ｈｙｂｒｉｄ、ＱＳＳＡ、Ｓｋｌａｒｅｗ三种计算方案求解非线性化学动力学方程组的差异，并引入误差分配和线性组合两种质量守恒技术，分析它们对模拟结果的影响．研究结果表明：不同方案对有机烃类浓度的计算几乎没有影响，但对其它气态物浓度有一定的影响．用ＱＳＳＡ和Ｓｌａｒｅｗ方案预测的结果更为相近，而采用Ｈｙｂｒｉｄ方案得到的气态物浓度的平衡时间略为提前．从计算效率来看，ＱＳＳＡ方案优于其它两种方案，两种质量守恒技术均能改善模拟结果．  相似文献   

浙江天目山自然保护区珍稀濒危植物及其利用与保护     

刘鹏  陈立人 《山地学报》1996,(1)

天目山是浙江省珍稀濒危植物最丰富的地区，共有国家保护的珍稀濒危植物２５科、３４属、３７种，其中属二级保护１３种，三级保护２４种．论述了天目山珍稀濒危植物的区系特点、类型及地理分布，列举了它们的一些利用价值，最后提出了保护天目山珍稀濒危植物的一系列建议．  相似文献   

浙江山区珍稀濒危植物的分布特征与保护     

刘鹏  陈立人 《山地学报》1996,(4)

浙江山区的珍稀濒危植物较为丰富，有６７科、１０８属、１２５种．论述了当地珍稀濒危植物的特点、地理分布、属和种的地理成分，探讨了珍稀濒危植物的就地保护、迁地保护和离体保存．  相似文献   

ANALYSIS OF SOIL EROSION CHARACTERISTICS AND SEDIMENT SOURCES FOR THE YANTZE THREE GORGES REGION     

SHI Deming  YANG Yansheng  LU Xixi  and LIANG Ying 《国际泥沙研究》1992,(2)

In this paper the researches made in 1981-1990 have identified that the annual soil loss in the Three Gorges region is 157 million t. and the annual incoming sediment load of the Three Gorges reservoir is 40 million t. Soil erosion increases with the destruction of vegetative cover and its subsequent evolution. The annual amounts of sediment erosion for forest land, shrub land, grassland and farmland make up respectively 6.19%, 10.76%, 23.05% and 60% of the total erosion of the Three Gorges region; the quantities of incoming sediment load to the Yangtze River from the above four types of land account for 5.95%, 12.42%, 35.46% and 46.1 % of the total amount of sediment transported to the reservoir. The farmland of offers the main source of sediment. Gravitational erosion produces more bed loads, which will present serious threat to the Three Gorges Project if entering the reservoir. Resettlement of people to the upper parts of the mountainous areas for agricultural production will increase the sediment yield of the Three Gorges region by 10-20 million t and increase the incoming sediment of the Yangtze River by 50-60 million t. Consequently, it is necessary to make a realistic assessment of the soil erosion in the Three Gorges region.  相似文献   

凉山州富铁矿资源的分布及开发     

陈广蓉  汪成开 《四川地质学报》1993,(1)

凉山州境内的富铁矿按成因可分为火山型、热液型、沉积变质型、沉积型等类型,本文逐一对其分布、地质特征及规模等方面进行了叙述和总结;对主要富铁矿产地和储量作了统计,并介绍了主要矿区开发现状及经济效益。提出了今后矿山开发、资源保扩及寻找富铁矿的建议。  相似文献   

Combining European Earth Observation products with Dynamic Global Vegetation Models for estimating Essential Biodiversity Variables     

Mateus Dantas de Paula  Marta Gómez Giménez  Aidin Niamir  Martin Thurner  Thomas Hickler 《International Journal of Digital Earth》2020,13(2):262-277

ABSTRACT

Global, fast and accessible monitoring of biodiversity is one of the main pillars of the efforts undertaken in order to revert it loss. The Group on Earth Observations Biodiversity Observation Network (GEO-BON) provided an expert-based definition of the biological properties that should be monitored, the Essential Biodiversity Variables (EBVs). Initiatives to provide indicators for EBVs rely on global, freely available remote sensing (RS) products in combination with empirical models and field data, and are invaluable for decision making. In this study, we provide alternatives for the expansion and improvement of the EBV indicators, by suggesting current and future data from the European Space Agencýs COPERNICUS and explore the potential of RS-integrated Dynamic Global Vegetation Models (DGVMs) for the estimation of EBVs. Our review found that mainly due to the inclusion of the Sentinel constellation, Copernicus products have similar or superior potential for EBV indicator estimation in relation to their NASA counterparts. DGVMs simulate the ecosystem level EBVs (ecosystem function and structure), and when integrated with remote sensing data have great potential to not only offer improved estimation of current states but to provide projection of ecosystem impacts. We suggest that focus on producing EBV relevant outputs should be a priority within the research community, to support biodiversity preservation efforts.  相似文献   

青藏高原沼泽合理利用与生态环境保育   总被引：4，自引：0，他引：4  

赵魁义 《湿地科学》2003,1(2):92-97

青藏高原有沼泽约491.3万hm2,是世界上最高的湿地。通过概要介绍高原沼泽湿地基本类型及其分布,重点阐述沼泽湿地利用、环境变化现状与存在的问题,为了保护高原生态环境,并持续利用湿地资源,提出了初步的看法和建议。  相似文献   

Coral reef health and effects of socio-economic factors in Fiji and Cook Islands     

Hoffmann TC 《Marine pollution bulletin》2002,44(11):1281-1293

This research focuses on coral reef health in the South Pacific region, an area of high global coral diversity. Coral reef health surrounding four island case studies in the Cook Islands and Fiji have been assessed in areas that have not been previously surveyed. This study compares four islands with barrier and fringing reefs that have different levels of economic development, population pressure, land-use practices, and marine management practices. This interdisciplinary research methodology includes both ecological and social data collection to further understanding of human environment interactions. In comparing the reefs with different socio-economic factors, this research shows that reefs with traditional systems of resources management are healthier, population pressure is not the main factor causing the demise of the reefs and agro-industry is the main industry causing the degradation of the reef in these four South Pacific Islands. In addition, researchers need to use a whole reef perspective to examine coral reef health.  相似文献   

嘉陵江流域水保治理前后沿程水沙变化研究   总被引：6，自引：0，他引：6  

马炼  张明波  郭海晋  沈燕舟 《水文》2002,22(1):27-31

嘉陵江为长江上游重要支流,是长江三峡水库重要的洪水和泥沙来源地。20世纪50年代初至80年代末,多年平均径流量701亿m3,多年平均悬移质输沙量近1.4亿t;“长治”工程的实施,对控制流域水土流失起到了较为明显的积极作用。以流域内主要控制站大量的实测水文气象资料为依据,重点研究了全流域水保治理前后的水沙变化情况及规律。  相似文献