AIMS Geosciences最新文献_第10页

Unprecedented occurrence of snow disasters over the Qinghai-Tibetan Plateau since 1980 1980年以来，青藏高原出现了前所未有的雪灾

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/geosci.2021033

Qi Liu, Leilei He, Jing Zeng, Yetang Wang

引用次数: 2

Ports and logistics: resilience, sustainability and new centrality in the post-pandemic perspective for Italy and EU Med ports 港口和物流:大流行后意大利和欧盟地中海港口的复原力、可持续性和新中心地位

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/geosci.2021018

Stefania Palmentieri

{"title":"Ports and logistics: resilience, sustainability and new centrality in the post-pandemic perspective for Italy and EU Med ports","authors":"Stefania Palmentieri","doi":"10.3934/geosci.2021018","DOIUrl":"https://doi.org/10.3934/geosci.2021018","url":null,"abstract":"This article is part of the Economic Geography studies and deals with aspects related to intermodal logistics with particular reference to maritime transport of containers. Ports are historically one of the key infrastructures for the Italian economy. In recent decades, along with many industrial sectors that were once driving forces for the national economy, due to the lack of adequate strategic planning, it has failed to keep pace with the rapid changes imposed on all sectors involved in the process of globalization of the economic world, losing ground and competitiveness with respect to many competing realities, both in Northern Europe and in the Mediterranean basin itself [1]. Most of the other states of Mediterranean Europe are in similar conditions, but Italy is probably the one that has lost the most ground. In this situation of strong economic and social imbalance, the covid-19 epidemic has hit Italy before and dramatically and if it had not turned into a pandemic, hitting the rest of Europe and the planet and forcing the European institutions to launch, for the first time, concrete support measures for all, would probably have represented a fatal shock for the Italian economy. By elaborating the information on statistical data and projections available in numerous international publications on the transport economy and more specifically on logistics, taking into account the reasons for the successes and failures of similar realities to the Italian one, the study offers food for thought on what to do immediately and in the future, taking advantage of the unique and unrepeatable opportunity constituted by the economic initiatives for the post-pandemic recovery, to remedy the lost ground by returning an adequate role to our world of maritime and port transport which can also be a driving force for the territory behind, avoiding ending up on the edge of the evolved world.","PeriodicalId":43999,"journal":{"name":"AIMS Geosciences","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70249187","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

Water resources management versus the world 水资源管理与世界

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/geosci.2021035

J. Greenway

引用次数: 1

Multimedia resources and movies in the new perspectives on teaching geography through CLIL and ICT 多媒体资源与电影在CLIL与ICT地理教学中的新视角

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/geosci.2021036

Ester Cristina Lucia Tarricone

引用次数: 2

Sustainability and risk perception: multidisciplinary approaches 可持续性和风险感知:多学科方法

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/GEOSCI.2021013

Gaetano Sabato, L. Mercatanti

引用次数: 0

Differentiated outlook to portray secondary cities in South Africa 以差异化的视角描绘南非的二级城市

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/geosci.2021026

Andre DW Brand, J. Drewes, M. Campbell

{"title":"Differentiated outlook to portray secondary cities in South Africa","authors":"Andre DW Brand, J. Drewes, M. Campbell","doi":"10.3934/geosci.2021026","DOIUrl":"https://doi.org/10.3934/geosci.2021026","url":null,"abstract":"Cities are playing an increasingly important role in the development and growth of countries. A country's growth and prosperity is largely dependent on the efficient functioning of its cities. The reliance of countries on the ability of their cities to perform crucial central functions, for national growth, continues to rise. South Africa has a long-standing network of cities, towns and localities. These have developed and become hierarchised over the course of history during which population settlements and their distribution have been influenced by colonisation, segregation, industrialisation and globalisation. Since 1911, South Africa has undergone an extended phase of intense urban growth, with areas such as Johannesburg, Cape Town and eThekwini (Durban) agglomerating into dominating economic spaces. There are, however, no universally accepted, distinct criteria that constitute the general characteristics of secondary cities. The common assumption is that secondary cities are those cities that find themselves below the apex of what are considered primary cities. Furthermore, internationally, secondary cities appear to be considered as important catalysts for balanced and dispersed economic growth. In the South African context, the notion of what constitutes secondary cities is to a large extent underdeveloped. The aim of the paper is to appraise interconnected regional networks as a differentiated and novel outlook when determining secondary cities in South Africa. What is evident from the paper is that there are different potential alternatives with which to portray secondary cities.","PeriodicalId":43999,"journal":{"name":"AIMS Geosciences","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70249415","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: 1

Consolidation parameters in silts from varied rate CPTU tests 从不同速率CPTU试验中得到的泥沙固结参数

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/geosci.2021039

A. Bihs, M. Long, S. Nordal, P. Paniagua

{"title":"Consolidation parameters in silts from varied rate CPTU tests","authors":"A. Bihs, M. Long, S. Nordal, P. Paniagua","doi":"10.3934/geosci.2021039","DOIUrl":"https://doi.org/10.3934/geosci.2021039","url":null,"abstract":"The interpretation of dissipation tests from cone penetration tests (CPTU) in silt is often considered challenging due to the occurrence of an unknown degree of partial consolidation during penetration which may influence the results significantly. The main objective of the present study is to investigate the influence of penetration rate and hence partial consolidation in silt deposits on the interpretation of consolidation parameters. Rate dependency studies have been carried out so as to give recommendations on how to establish design consolidation parameters in silts and consider the effect of partial consolidation on the development of design parameters. A comprehensive field and laboratory research program has been conducted on a silt deposit in Halsen-Stj?rdal, Norway. Alongside performing various rate penetration CPTU tests with rates varying between 0.5 mm/s and 200 mm/s, dissipation tests were executed to analyze the consolidation behaviour of the soil deposit. Furthermore, a series of soil samples have been taken at the site to carry out high quality laboratory tests. Correction methods developed for non-standard dissipation tests could be successfully applied to the silt deposit indicating partial consolidation. The results revealed an underestimation of the coefficient of consolidation if partial consolidation is neglected in the analysis, emphasizing the importance of considering the drainage conditions at a silt site thoroughly. To study the drainage conditions of a soil deposit a recently proposed approach has been applied introducing a normalized penetration rate to differentiate between drained and undrained behaviour during penetration. It is suggested that a normalized penetration rate of less than 0.1–0.2 indicate drained behaviour while a normalized penetration rate above 40–50 indicate undrained behaviour. Finally, available dissipation test data from a Norwegian Geo-Test Site (NGTS) in Halden, Norway have been used to successfully verify the recommendations made for silts.","PeriodicalId":43999,"journal":{"name":"AIMS Geosciences","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70249440","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: 2

Groundwater exploration in hard rock terrains of East Godavari district, Andhra Pradesh, India using AHP and WIO analyses together with geoelectrical surveys 利用AHP和WIO分析结合地电测量在印度安得拉邦东戈达瓦里地区硬岩地形进行地下水勘探

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/geosci.2021015

P. V. Rao, M. Subrahmanyam, B. A. Raju

{"title":"Groundwater exploration in hard rock terrains of East Godavari district, Andhra Pradesh, India using AHP and WIO analyses together with geoelectrical surveys","authors":"P. V. Rao, M. Subrahmanyam, B. A. Raju","doi":"10.3934/geosci.2021015","DOIUrl":"https://doi.org/10.3934/geosci.2021015","url":null,"abstract":"The need for groundwater exploration in India has been increasing enormously, due to the non-judicial use of available water resources. The present study area is located between longitudes from 81°52′20.293′′ to 82°29′32.058′′ E and latitudes from 17°01′6.71′′ to 17°38′ 12.906′′ N in the Eastern Ghats mobile belt region of East Godavari district. The study area is characterized by a wide range of geological settings and high and irregular topographic features. The area is identified by Government as highly backward and Tribal people dwell here. For exploring good aquifer in the study area, the information of ten parameters together with geoelectrical resistivity data has been collected. Analytical Hierarchy Process (AHP) is used as the decision-making technique which uses the weights of different thematic layers (parameters) favorable for groundwater recharge, storage and location. Various thematic layers (parameters) of geology, geomorphology, soil, slope, lineament density, drainage density, groundwater level, Land use/Land cover, rainfall and coefficient of electrical anisotropy were considered in this analysis. A comprehensive groundwater prospect map has been prepared and validated with aquifer thickness map derived from the analysis of geoelectrical data. The entire study area has been classified into different potential zones of good, moderate and poor for groundwater exploration. The good groundwater potential zone is covering an area of 750.91 sqkm (28.4%) with aquifer thickness varying in the range 40–140 m, moderate potential zone encompasses 46.1% of the study area with an areal extent of 1220.33 sqkm and aquifer thickness is about 20–40 m. The remaining area of 24.5% is poor aquifer zone with thickness less than 20 m.","PeriodicalId":43999,"journal":{"name":"AIMS Geosciences","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70249114","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: 5

Beyond the implications of Grand Ethiopian Renaissance Dam filling policies 超越大埃塞俄比亚复兴大坝蓄水政策的影响

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/geosci.2021019

A. Yimere, E. Assefa

{"title":"Beyond the implications of Grand Ethiopian Renaissance Dam filling policies","authors":"A. Yimere, E. Assefa","doi":"10.3934/geosci.2021019","DOIUrl":"https://doi.org/10.3934/geosci.2021019","url":null,"abstract":"The Grand Ethiopian Renaissance Dam (GERD) in Ethiopia and High Aswan Dam (HAD) in Egypt both operate on the Nile River, independent of a governing international treaty or agreement. As a result, the construction of the GERD, the Earth's eighth largest dam, ignited a furious debate among Ethiopia, Sudan, and Egypt on its filling policies and long-term operation. Ethiopia and Egypt's stance on the Nile River's water resources, combined with a nationalistic policy debate on the GERD's filling policies and long-term operation, has severely affected progress toward reaching agreeable terms before the first round of GERD filling was completed. These three countries continue to debate on the terms of agreement for the second round of GERD filling, scheduled to start by July 2021. We examined the GERD filling strategy for five- and six-year terms using time series data for the periods 1979–1987 and 1987–1992 to combine analyses for dry and wet seasons and investigate the potential impacts of filling the GERD above the downstream HAD using four HAD starting water levels. A model calibrated using MIKE Hydro results shows that during both five- and six-year terms of future GERD filling, Egypt would not need to invoke the HAD's minimum operating level. We pursued a narrative approach that appeals to both a technical and non-technical readership, and our results show the urgent need for cooperation at both policy and technical levels to mitigate and adapt to future climate change through the development of climate-proof agreements. Moreover, the results call for the riparian countries to move away from the current nationalistic policy debate approach and pursue a more cooperative, economically beneficial, and climate adaptive approach.","PeriodicalId":43999,"journal":{"name":"AIMS Geosciences","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70249226","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: 2

The technical challenges and outcomes of ground-penetrating radar: A site-specific example from Joggins, Nova Scotia 探地雷达的技术挑战和成果:以新斯科舍省约金斯为例

IF 1.3

AIMS Geosciences Pub Date : 2021-01-01 DOI: 10.3934/GEOSCI.2021002

T. Kelly, G. Wach, D. O'Connor

{"title":"The technical challenges and outcomes of ground-penetrating radar: A site-specific example from Joggins, Nova Scotia","authors":"T. Kelly, G. Wach, D. O'Connor","doi":"10.3934/GEOSCI.2021002","DOIUrl":"https://doi.org/10.3934/GEOSCI.2021002","url":null,"abstract":"The Carboniferous Joggins Formation is known for its complete succession of fossil-rich, coal-bearing strata, deposited in a fluvial meanderbelt depositional setting. Hence, the Joggins Formation outcrop is an excellent analogue for studying the 2D geological complexities associated with meanderbelt systems. In this research, a conventional ground-penetrating radar system was tested with the intent of imaging near-surface, dipping, strata of the Joggins Formation (potentially with subsequent repeats as annual erosion provides new visual calibrations). The survey was unsuccessful in its primary goal, and for future reference we document the reasons here. However, the overlying near-surface angular unconformity was successfully imaged enabling mapping of the approximately 8 m of overlying glacial till. A successful outcome would have allowed observations from the 2D outcrop to be extended into 3D space and perhaps lead to an increased understanding of the small (e.g., bedform baffles and barriers) and large (e.g., channel bodies) scale architectural elements, meanderbelt geometry, and aspect ratios. The study comprises a 42-line, 3.46 km ground-penetrating radar survey using a Sensors and Software pulseEKKO Pro SmartCart system. It was combined with a real-time kinematic differential global positioning system for the georeferencing of survey lines. The 50 MHz antenna frequency, with a 1 m separation, was chosen to maximize the depth of penetration, while still maintaining a reasonable resolution. The results show that many of the lines are contaminated with diffraction hyperbolae, possibly caused from buried objects near or under the survey lines or surface objects near the survey lines. A total of thirteen unique radar reflectors are described and interpreted from this work. The thick clay-rich soil overlying the Joggins Formation probably contributed to significant signal attenuation and the nature of the Carboniferous strata (dip of the beds, pinching and swelling of the beds, bed thickness, etc.) also contributed to imaging difficulties.","PeriodicalId":43999,"journal":{"name":"AIMS Geosciences","volume":"92 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70249384","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: 1