Impact on Mountainous Agricultural Development in the Three Gorges Reservoir Area forced by Migrants of the Three Gorges Project

The Three Gorges Project attracts worldwide attention because of the Three Gorges migrants, and the agriculture of the Three Gorges Reservoir Area is a foundation for the development of the Three Gorges migrants. The Three Gorges Reservoir Area is situated at the mountainous area with bad agricultural development conditions and relatively low levels of development. As a result, the large-scale migration fias special influence on its agricultural development, which has attracted much attention. The paper analyzes influence that the migrants have forced on its agricultural development based on the scientific data, and makes some explorations on the models that are suitable for the development of mountainous agriculture in the Three Gorges Reservoir Area.     

Radiological and multi-element analysis of sediments from the Proserpina reservoir (Spain) dating from Roman times

The Proserpina dam was built in Roman times to provide drinking water to Emerita Augusta (today's Mérida in SW Spain). During maintenance work, a sediment core was extracted, offering an excellent opportunity to analyze the historical environmental impacts of the dam and its reservoir over the 2000 years since Roman times. In order to establish an accurate chronology, ¹⁴C ages were determined by accelerator mass spectrometry (AMS). Core samples were assayed for their content in uranium and thorium series isotopes, ⁴⁰K, and the anthropogenic radionuclides ¹³⁷Cs, ⁹⁰Sr, and ^239+240Pu. Potassium-40 presented the highest activity level and was not constant with depth. The uranium and thorium series were generally in equilibrium, suggesting there had been no additional input of natural radionuclides. The presence of ¹³⁷Cs was only found in relation with the global fallout in the early 1960s. Multi-element assays were performed using the PIXE and PIGE techniques. Some variations in the multi-element concentrations were observed with depth, but the sediment core could be considered as clean, and no presumptive anthropogenic pollutants were found. Nevertheless, an unusually high Zn content was detected at depths corresponding to pre-Roman times, due to geological anomalies in the area.     

安徽太平湖水库饵料生物资源及其变化研究

１９９２年１１月至１９９３年８月，对太平洋水库浮游生物和底栖动物的周年调查结果表明，该库的天然饵料资源比较丰富，与８年前的资料相比，各类饵料生物的生物量均有较大幅度的增加，饵料生物的年产鱼潜力合计约为１２５万ｋｇ，化学分析结果显示，太平湖水库目前水质状况尚好。     

DEVELOPING TREND ANALYSIS AND FORECAST OF DEBRIS FLOW ACTIVITIES IN THE THREE-GORGE RESERVOIR AREA

TheThree GorgeReservoirisatypicalrivervalley typereservoir,whoseplanefigureislikeafunnelandthetrunkstreamis 6 90km long.TheareaontheeastofFengjieistheworldfamousThree Gorgearea,whichismainlycomposedofmountainousregions.Thepopulationdensityisnotveryhighexceptinsomecities/towns,andthepeoplelivedispersivelyinthemountainareas.Thelandformsbelongtotheerosion,corrosionanddenudationtypesofthewestHubeiProvince.OnthewestofFengjieisahillylandlyingintheeastofSichuanBasin.Thetopographyand geologicenvi…     

三峡库区（湖北部分）珍稀濒危保护植物资源现状

对长江三峡库区（湖北部分）宜昌,兴山,秭归和巴东４县的调查表明,三峡库区天然分布有殂稀濒危植物４０种,隶属２７科３６属,分别占湖北省总数６２种和全国总数３８８种的６４．５％和１０．３％;天然分布有国家重点保护植物１３１种,隶属２７科７３属,分别占湖北省总数的２０６种和全国总数的１７００多种的６３．６％和７．７％,其中国家一级保护植物有红豆杉、南方红豆杉、珙酮、光叶珙酮４种。国家二级保护植物有金毛狗     

清江水布垭水库农村移民安置区环境容量研究

清江是长江流出三峡之后的第一条大支流,发源于鄂西利川市,自西向东流经湖北省的１０个县（市）,于宜都市注入长江,在清江建设水布垭水电站是“流域,梯极,滚动,综合”开发利用清江水利资源的重要决策,将促进区域经济的发展。水布垭水库淹没涉及巴东,鹤峰,建始,宣恩,恩施５县（市）的陆地面积５５．４ｋｍ＾２,其中耕园地１１４７．８ｈｍ＾２。     

三峡库区水土保持与生态环境改善

介绍了三峡库区水土流失现象,分析了水土流失发生的原因,阐述了水土流失对库区生态环境的影响。主要表现在：破坏土地资源,淤毁水利工程、抬高河床,加强洪旱等灾害,污染水资源。     

三峡库区城镇移民迁建的问题与对策

根据三峡库区城镇迁宾方针、目标和原则,结合当胶城镇的迁建状况,总结出迁建过程中存在的７个主要问题：（１）迁建城镇人口和用地规模普遍偏大;（２）城市用地布局过于分散;（３）盲目跨江发展,大量库区岸线被占用;（４）移民就业安置不够落实;（５）“二次移民”返贫现象出现;（６）对城市搬迁与城市功能再造认识不足;（７）城镇迁建区生态,环境破坏严重。     

黑龙滩水库风景区旅游容量的探讨

本文从黑龙滩风景区自然景点、游览线路、旅游开发方式、适度活动面积及空间容量计算，基础设施容量计算以及环境污染承受能力等几个方面综合计算了黑龙滩水库风景区的旅游容量。并对适度旅游容量下如何开发利用风景区旅游资源进行了探讨。     

SIMULATING SEDIMENT TRANSPORT IN THE CARSON RIVER AND LAHONTAN RESERVOIR,NEVADA, USA1

ABSTRACT: The discovery of the Comstock Lode in western Nevada in 1859 initiated the use of liquid mercury (Hg) or “quicksilver” to remove gold (Au) and silver (Ag) from crushed ore. Today, Hg is present in historic mill tailings piles, in alluvial deposits adjacent to the Carson River, and in Lahontan Reservoir. Mercury concentrations in Carson River water have been reported as high as 61 μg/L by the U.S. Geological Survey. Fish from Lahontan Reservoir have methylmorcury (MeHg) concentrations as much as four times the 1.0 μg/g limit for human consumption. Since more than 95 percent of total Hg in water can be associated with particulates, the transport of sediment must be quantified to understand the fate of Hg in the system. By linking the RIVMOD hydrodynamic model with the WASP5 water quality model, and using suspended sediment rating curves along with bedload transport equations, reliable predictions of sediment transport can be made. Measured suspended sediment data from the Carson River, and an estimate of annual sediment loading to Lahontan Reservoir, were used to create a calibrated sediment transport model. Model simulations predicted the long term transport of sediment into Lahontan Reservoir, the transport of sediment into Lahontan Reservoir during a flood year (1986 water year), and concentrations of total Hg in the Carson River using an estimate of sediment Hg concentrations. This research will eventually be used with an Hg model to predict the fate of Hg in the river and reservoir system.