Earth Science Research最新文献_第5页

Geological-Structural Position and Formation Conditions of Gold-Containing Porphyry Copper Deposits of Mekhmanian Ore-Magmatic System (Lesser Caucasus, Azerbaijan) 亚塞拜然小高加索地区梅赫曼尼亚矿-岩浆体系含金斑岩铜矿床地质构造位置及形成条件

Earth Science Research Pub Date : 2019-01-25 DOI: 10.5539/ESR.V8N1P39

Mansurov I. Mamoy, Tahmazova H. Tarana, Sattarzadeh A. Nigar

引用次数: 0

Mineralogical, Geotechnical Characterization and Stability of the Cut Slopes of Widikum and its Surroundings (North-West Cameroon) 喀麦隆西北部Widikum及其周边地区切坡的矿物学、岩土学特征及稳定性

Earth Science Research Pub Date : 2018-08-28 DOI: 10.5539/ESR.V8N1P1

O. Kenmoe, Valentine Katte Yato, F. Ngapgue, A. Wouatong

{"title":"Mineralogical, Geotechnical Characterization and Stability of the Cut Slopes of Widikum and its Surroundings (North-West Cameroon)","authors":"O. Kenmoe, Valentine Katte Yato, F. Ngapgue, A. Wouatong","doi":"10.5539/ESR.V8N1P1","DOIUrl":"https://doi.org/10.5539/ESR.V8N1P1","url":null,"abstract":"The Widikum highlands and its surroundings are located in the North West Region of Cameroon. These five last years, landslides are frequently affecting movement on this portion of the highway. An investigation for understanding the mechanism of these phenomena was recently performed to clarify and to propose suitable remediable solutions. The study included mineralogical and geotechnical characterization of the local soil materials. The X-ray diffraction mineralogical analysis on clay fractions reveals the presence of phyllitic minerals (kaolinite, gibbsite, montmorillonite, illite and biotite). Associated minerals are mainly represented by quartz. Montmorillonite has the small crystal and largest surface which aid in increasing its adsorptive capacity. Clayed minerals can cause swelling and consequently the change or variation of the mechanical characteristics of the materials. The natural water content of weathered products vary from 27 to 47.4% which are close or even lower than the liquid limit included between 59.4 and 71.9%, this justify their unstable character. In addition, the high plasticity index ranges between 17.9 and 29.3% and is indicative of plastic materials thus very sensitive to creep. Moreover, the saturation ratio is very high (60 - 96%) thus attesting to their quasi saturated state. It is advisable to reduce the height of the steps to 2.3m by opting for a bench of 3m and adopting an inclination angle of β = 37.5°. Building retaining structures as well as eucalyptus and vertiva grass planting is recommended to reduce landslide incidences.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82467357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Biochars from Bio-Waste for Removing Pollutants from River Water 生物废弃物制备生物炭去除河水污染物的研究

Earth Science Research Pub Date : 2018-08-27 DOI: 10.5539/esr.v8n1p12

Yiyun Wu, Xinhua Xu

引用次数: 0

Reviewer Acknowledgements for Earth Science Research, Vol. 7, No. 2 《地球科学研究》第七卷第2期审稿人致谢

Earth Science Research Pub Date : 2018-07-30 DOI: 10.5539/esr.v7n2p113

Lesley Luo

引用次数: 0

Compost Biofilters for Protection of Environmentally Sensitive Areas Receiving Roadway Runoff 堆肥生物过滤器用于保护环境敏感地区接收道路径流

Earth Science Research Pub Date : 2018-07-17 DOI: 10.5539/esr.v7n2p88

D. McTaggart, W. Trenouth, Stephen Stajowski, Hani Farghaly, Bahram Gharabaghi

{"title":"Compost Biofilters for Protection of Environmentally Sensitive Areas Receiving Roadway Runoff","authors":"D. McTaggart, W. Trenouth, Stephen Stajowski, Hani Farghaly, Bahram Gharabaghi","doi":"10.5539/esr.v7n2p88","DOIUrl":"https://doi.org/10.5539/esr.v7n2p88","url":null,"abstract":"Runoff from roads is well recognized as containing a host of heavy metals that may degrade water quality. This awareness has driven a focus towards management strategies intended to attenuate the transport of heavy metals to nearby water bodies. Composted biomass has been shown to have the ability to retain common roadway runoff pollutants, leading to interest in its use as a filter material for the protection of environmentally sensitive areas. Compost biofilters can be constructed in a tubular geometry to intercept surface flow and can be amended with polymers for the targeted removal of specific pollutants. Addressing the need for validation of this concept under field conditions, commercially available tubular biofilters with three different polymeric amendments were studied to assess their efficiency in removing heavy metals and total suspended solids. The filters each contained a mixture of municipal compost and were installed in series as a treatment train adjacent to a busy section of highway 401 in southern Ontario, Canada. Untreated inflow concentrations of chromium, cadmium, copper and lead exceeded Ontario Provincial Water Quality Objectives (PWQO). The biofilter treatment train reduced chromium to below its PWQO, while copper remained above. Results demonstrate removal efficiencies for the treatment train ranging from 15.5% (nickel) to 93.6% (chromium). The low removal efficiency of nickel is attributed in part to its low inflow concentration. Each consecutive filter also reduced TSS concentrations, with an event mean removal efficiency of 50% for the treatment train as a whole. ","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87773844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Late Quaternary Environments of the Teton Mountains, Wyoming: A Pollen Record from Green Lake 怀俄明州提顿山脉的晚第四纪环境:来自格林湖的花粉记录

Earth Science Research Pub Date : 2018-07-17 DOI: 10.5539/ESR.V7N2P99

B. Balmaki, P. Wigand

{"title":"Late Quaternary Environments of the Teton Mountains, Wyoming: A Pollen Record from Green Lake","authors":"B. Balmaki, P. Wigand","doi":"10.5539/ESR.V7N2P99","DOIUrl":"https://doi.org/10.5539/ESR.V7N2P99","url":null,"abstract":"Late Quaternary forest succession in Wyoming’s Rocky Mountains, occurred in random patterns, because it reflects differences between the Glacial vegetation at lower elevations on the east vs. the west of the Rockies, as well as along the mountain crest to the south. Differential melting of mountain glaciers resulted in differences in the timing of recolonization. Significant variations in the composition of plant assemblages occurred due to delays in species’ arrival, and even in the exclusion of species. Holocene climate variability, especially ongoing global warming, added to the complex dynamics of plant assemblages with warm climate species replacing early Holocene, cooler climate species. The pollen record from Green Lake (located in a glacial cirque on the west side of the Teton Mountains in Teton County, Wyoming) addresses the local vegetation response from just before the fall of Mazama ash to the end of the middle Holocene warm period. Although the earlier portion of the pollen sequence records some of the last adjustments as some plant species were still arriving after de-glaciation, by the time Mazama ash fell it was climate variation that determined most of the dynamics observed in the Green Lake record. The results reveal a sequence of wetter and drier periods based upon the presence of diagnostic tree species. A moist late early Holocene was followed by a dry middle Holocene, which ended about 6,400 cal. B.P., and was followed between 5,000 to 2,800 cal. B.P. by a sequence of drier and moister climate episodes.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81681666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristics of Mudstone in Complex Fluvial Sedimentary System in Bohai L Oilfield 渤海L油田复杂河流沉积体系泥岩特征

Earth Science Research Pub Date : 2018-07-08 DOI: 10.5539/esr.v7n2p79

K. Huang, Chunsheng Shen, Kai Kang, Libing Wang, Zhongbo Xu, Lin Li

{"title":"Characteristics of Mudstone in Complex Fluvial Sedimentary System in Bohai L Oilfield","authors":"K. Huang, Chunsheng Shen, Kai Kang, Libing Wang, Zhongbo Xu, Lin Li","doi":"10.5539/esr.v7n2p79","DOIUrl":"https://doi.org/10.5539/esr.v7n2p79","url":null,"abstract":"Bohai L oilfield develops a complex fluvial sedimentary system, which includes many types of fluvial sedimentary facies. Based on the coring well of oil field, the distribution characteristics of mudstone are analyzed, it is shown that the mudstone has similar internal structure and can be classified into four types according to its color: gray to grayish, variegated, brown to gray-brown and khaki, the assemblage has a large gray to grayish mudstone section, large gray to grayish mudstone intercalated thin layer sandstone, gray to grayish mudstone associated with variegated (brown) mudstone, grayish mudstone associated with lacustrine sand grain bedding sandstone, concomitant generation of large staggered bedding sandstone and grayish mudstone, mixed (gray-brown) mudstone associated with large staggered bedding sandstone, interaction between different colors of mudstone and sandstone and large interlaced sandstone intercalated with thin layer mudstone. The mudstone color is mainly gray and grayish, and very few oxidized mudstone is developed alone, which indicates that fluvial mudstone may be formed in the reductive environment in humid climate, and the fluvial mudstone in this area may be formed in the oxidizing environment, which is different from the general understanding of fluvial facies, the oxidation color is the result of the later transformation.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83705684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Sandbody Development Model in Lishui Depression 丽水坳陷砂体发育模式分析

Earth Science Research Pub Date : 2018-07-08 DOI: 10.5539/esr.v7n2p74

Guowei Hou, Jinshui Liu, Kun Cai, Yonggang Wang

引用次数: 0

Reference Time of Concentration Estimation for Ungauged Catchments 未计量集水区浓度估计的参考时间

Earth Science Research Pub Date : 2018-05-21 DOI: 10.5539/ESR.V7N2P58

J. Perdikaris, Bahram Gharabaghi, R. Rudra

{"title":"Reference Time of Concentration Estimation for Ungauged Catchments","authors":"J. Perdikaris, Bahram Gharabaghi, R. Rudra","doi":"10.5539/ESR.V7N2P58","DOIUrl":"https://doi.org/10.5539/ESR.V7N2P58","url":null,"abstract":"Accurate modelling of flood flow hydrographs in ungauged catchments is a challenging task due to large errors in the estimation of its response time using existing empirical equations. The time of concentration (Tc) is a key catchment response time parameter needed for forecasting of the peak discharge rate and the timing of the flood event. At least eight different definitions have been presented in the literature for the time of concentration. In this study, a new definition of “Reference Tc” is presented along with a practical procedure for its estimation using readily available basin catchment characteristic parameters with the aim of standardizing this key parameter for practitioners. Nine different empirical models were calibrated and tested on nine catchments of the Credit River watershed, Ontario, Canada to determine which method would provide the most accurate prediction of the Reference Tc. The NRCS velocity method (1986) proved once again to be the most reliable and an accurate method. This study shows that the main reason for the higher accuracy of the NRCS velocity method predictions compared to the empirical equations is attributed to the inclusion of the Manning's roughness coefficient.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86133830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 23

Evaluation of the Simplified Dynamic Wave, Diffusion Wave and the Full Dynamic Wave Flood Routing Models 简化动力波、扩散波和全动力波洪水路径模型的评价

Earth Science Research Pub Date : 2018-05-04 DOI: 10.5539/ESR.V7N2P14

J. Perdikaris, Bahram Gharabaghi, R. Rudra

引用次数: 11