Underground water quality model inversion of genetic algorithm     

MA Ruijie  LI Xin 《世界地质(英文版)》2009,12(3):164-167

The underground water qualitymodel with non-linear inversion problem is illposed, and boils down to solving the minimum of nonlinear function. Genetic algorithms are adopted in a number of individuals of groups by iterative search to find the optimal solution of the problem, the encoding strings as its operational objective, and achieving the iterative calculations by the genetic operators. It is an effective method of inverse problems of groundwater, with incomparable advantages and practical significances.  相似文献   

Water, organic matter, nitrogen and phosphorus contents in sediment of a large-scale mariculture area in the Zhelin Bay of eastern Guangdong Province, China     

DONG Qiaoxiang  LIN Jun  SHANG Xu  LI Jin  HUANG Changjiang 《海洋学报(英文版)》2008,27(2):133-148

The Zhelin Bay is one of the most important bays for large-scale mariculture in Guangdong Province, China. Owing to the increasing human population and the expanding mariculture in the last two decades, the ecological environment has greatly changed with frequent harmful algal blooms. A monthly survey of water content, organic matter （TOM）, and various forms of nitrogen and phosphorous in sediment from July 2002 to July 2003 in the bay was conducted. The results showed that the water content was correlated significantly with TOM and various forms of nitrogen and phosphorus and can be used as proxy for quick and rough estimate of these factors in the future surveys. TOM was also correlated significantly with various forms of nitrogen and phosphorus, indicating that it was one of the key factors affecting the concentrations and distributions of nitrogen and phosphorus in the investigated waters. Average total Kjeldhal nitrogen （TkN） content was（ 1 113.1 ± 382.5）μg/g and average total phosphorus （TP） content was（567.2± 223.3）μg/g, and both were much higher than those of similar estuaries in China and elsewhere. Average nitrogen and phosphorus tended to be higher inside than outside the bay, higher at aquaculture than non-aquaculture areas, and higher at fish-cage culture than oyster culture areas, suggesting that large-scale mariculture inside the bay played an important role in the eutrophication of the Zhelin Bay. Various forms of nitrogen and phosphorus concentrations were higher during the warm season （July--September）, which was due to the increased decomposition and concentration of organic matter resulted from the fast growth and high mortality of the cultured species. Compared with July 2002, TkN and TP contents were much higher in July 2003, in consonance with the eutrophication of the Zhelin Bay. Because exchangeable phosphorus （Ex-P）, iron-bounded phos- phorus （Fe-P） and organic phosphorus （OP） combined accounted for 34.3% of the TP and authigenic phosphorus （Au-P  相似文献   

溶菌酶和抗菌肽在对虾养殖中的应用          下载免费PDF全文

张海波  吴嘉敏  谭洪新  王兴强  阎斌伦 《海洋科学》2008,32(6):61-65

近年来，我国对虾养殖业取得了巨大进步。然而，随着养殖环境日趋恶化和人为原因导致的水质污染等问题的出现，使我国的养虾业依旧面临着流行性病原（细菌、病毒和真菌）的考验。为了从源头上防治和根除这些疾病，国内外一些专家、学者对对虾的先天免疫特别是溶菌酶（Lysozyme）和抗菌肽（Anti—microbial Peptides，AMPs）及其基因工程方面做了深入的研究并且有了一定进展。  相似文献   

闽江口入海悬沙输运的数值模拟   总被引：1，自引：0，他引：1  

汤军健  余兴光  陈坚  陈楚汉  李东义 《台湾海峡》2009,28(1):90-95

闽江河口位于福建省东部，本文利用欧拉-拉格朗日差分方法模拟闽江口及附近海域在不同径流下的潮流场，并建立拉格朗日水质点跟踪方法近似模拟了悬沙在海域中的迁移过程．水质点运动轨迹计算结果表明，闽江口悬沙在外海主要向南方或东南方输运，其轨迹呈现螺旋线．在洪峰流量下，悬沙运移距离较远．  相似文献   

连云港近海海域水质的季节和年际变化   总被引：2，自引：0，他引：2  

田慧娟  杨华  刘吉堂  吕海滨 《海洋湖沼通报》2009,(4)

根据1992～2005年连云港近海海域水质监测资料,对该海域水质的季节变化和年际变化进行研究.结果表明,近海水质有明显的季节变化特征,其中盐度从春、夏季到秋季缓慢降低,冬季升高;溶解无机氮(DIN)与盐度恰恰相反,夏秋季最高且监测的超标率高.溶解氧季节性非常明显,依次为冬季>春季>秋季>夏季.总体上春冬季水质好于夏秋季.年际变化显示,1992～2005年pH和盐度均有降低趋势,尤其是2003年以后降幅更加明显;DO和COD年际变化相对平稳但季节变化幅度较大;2000年12月后油类浓度明显降低且年际变化平稳;近几年DIN有明显增加趋势,无机氮已成为该海域主要污染物.  相似文献   

提高供水井开发质量的技术措施     

吕泽 《黑龙江国土资源》2007,(8):60-61

水井的成井质量主要有3个指标：单井可能提供的出水量；提供的水质；水井有效服务寿命。[第一段]  相似文献   

Mountain Water Tower and Ecological Risk Estimation of the Mesta-Nestos Transboundary River Basin （Bulgaria-Greece）   总被引：2，自引：1，他引：1  

K. Grunewald J. Scheithauer J.-M. Monger N. Nikolova 《山地科学学报》2007,4(3):209-220

The Mesta-Nestos river basin in Bulgaria and Greece is a case study for transboundary decision-making support in south-eastern Europe and a show-case for the development of methodologies and information-gathering for the integrated regional planning of water resources. Land-use conflicts in this water-scarce region cover a wide spectrum of activities like agricultural irrigation,drinking water production,diversions for industrial water,and risk of pollution from mining,to name a few examples. Measurements of the water quality were carried out in the upper basin. Results will be illustrated by the example of the environmental situation in the alpine region of the Pirin National Park as well as in the Razlog Basin with a stronger anthropogenic impact and pollution around a former uranium mine near the village of Ele?nica. The social and economic development of this transboundary region is a recently established priority for the future. It will mean an increase in water usage and more stress for the water resources if regional impacts of global climate change are verified. Problem-focused management of the catchment area as a whole on the basis of proved geo-data sets is needed for the future.  相似文献   

建立土地督察制度加强改善宏观调控——在河南省加强土地调控严格国土资源管理工作会议上的讲话(摘要)     

刘志萍 《资源导刊(河南)》2007,(4)

建立国家土地督察制度是党中央、国务院落实科学发展观、加强和改善宏观调控的重大举措,也是改革行政管理体制和建立最严格的土地管理制度的重要内容.  相似文献   

温度和体重对花尾胡椒鲷幼鱼最大摄食量的影响     

王瑁  丘书院 《台湾海峡》2000,19(4):484-488

研究了花尾胡椒鲷幼鱼的最大摄食量与温度和体重的关系。花尾胡椒鲷幼鱼的最大摄食量与体重呈正相关 ,二者的关系为 :Cmax=1 5 95 .3W0 .6 87(Cmax:最大摄食量 ,J/d ;W :体重 ,g)。最大摄食量随温度的变化情况为 :在实验温度为 2 2～ 2 8℃范围内 ,二者呈正相关 ,超过 2 8℃之后呈负相关。最大摄食率与体重的相关关系为 :Rmax=1 5 0 7.6W-0 .313[(Rmax:最大摄食率 ,J/(d·g) ]。采用回归分析 ,建立了由温度和体重预测该种鱼的最大摄食量和最大摄食率的模型 :Cmax=2 86 790e-0 .90 4ln(T3-77.738T2 1985 .185T -16 42 9.710 ) W0 .6 16 　n =1 6 ,r =0 .994Rmax=0 .887e1.2 6 4ln(-T3 78.0 6 1T2 -2 0 0 3.397T 172 36 .5 2 0 ) W-0 .2 83　n =1 6 ,r=0 .978  相似文献   

利比里亚宝米铁矿阶段性勘查工作圆满完成     

张庆  江雪岩 《河南国土资源》2014,(6)

正5月底,河南地矿局第二地质矿产调查院承担的香港宝豫有限公司"利比里亚宝米东部山区铁矿勘查"项目阶段性勘查工作已经圆满完成。2013年8月30日,宝豫利比里亚公司与该院在郑州签署了《利比里亚共和国宝米东部山区铁矿勘查合同》。其主要内容是完成利比里亚共和国巴布罗州宝米东部山区铁矿探矿权(探矿权证号:MEL12005)区内43.26平方公里的铁矿普查,并在其中优选的10平方公里进行详查。合同签订以后,经过一个多月的紧张筹备,该院从2013年10月开始陆续派人到达矿区,11月初全部人员  相似文献