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Structural Mapping of Kakobola and Its Surroundings by Analyzing Geomagnetic Data 利用地磁资料分析进行Kakobola及其周围构造填图
Pub Date : 2023-01-01 DOI: 10.4236/gep.2023.119006
Jonathan Musitu Muliwavyo, Albert Mbata Muliwavyo, Lumière Musitu, Jean-Marie Tshitenge Mbuebue, Clément N’Zau Umba-Di-Mbudi
This study focuses on the Kakobola region and its surroundings where cavities discovered in its basement may represent a major risk for the hydroelectric dam erected on the Lufuku River near the Kakobola city and the civil engineering works in the study area. In order to deepen the studies related to this understudied region and provide decision-makers with information that will enable them to make the necessary and appropriate decisions regarding the development of this area, a study based on the analysis of geomagnetic data was carried out using certain methods revealing more shallow than deep structures, and others highlighting the limits of both shallower and deeper structures. Total magnetic anomalies and reduced to equator (RTE) magnetic anomalies were used to map the subsurface of the Kakobola region and its surroundings. In order to detect the edges of magnetized structures, the horizontal gradient magnitude (HGM), the analytic signal (AS), the horizontal gradient of tilt angle (HGTA), the tilt angle (TA), the theta map (TM), the enhanced total horizontal derivative of the tilt angle (ETHDR), the tilt angle of the horizontal gradient (TAHG), and the tilt angle of analytic signal (TAAS) were used. The study area is characterized by two areas of low values of magnetic anomalies and two other sources of high magnetic anomalies located in the bed and the neighborhood of the two major rivers in the region. The shallow sources of magnetic anomalies are lying in the bed and the vicinity of the same rivers in the study area. The magnetic sources in the study area are connected and almost linear. Several magnetic lineaments identified in this region by different methods present several preferential directions, but the most predominant directions are NE-SW, NW-SE, W-E and NE-SW.
本研究的重点是Kakobola地区及其周边地区,在其地下室发现的空洞可能对Kakobola市附近Lufuku河上的水电站大坝和研究区域的土木工程构成重大风险。为了加深对这一研究不足地区的研究,并向决策者提供信息,使他们能够就该地区的开发做出必要和适当的决策,一项基于地磁数据分析的研究采用了一些方法,揭示了较浅的构造,而不是深层的构造,其他方法则突出了较浅和较深构造的局限性。利用总磁异常和赤道还原磁异常(RTE)对Kakobola地区及其周边地区进行了地下地形图绘制。为了检测磁化结构的边缘,采用了水平梯度幅度(HGM)、解析信号(AS)、倾斜角度水平梯度(HGTA)、倾斜角度(TA)、θ映射(TM)、倾斜角度增强总水平导数(ETHDR)、水平梯度倾斜角(TAHG)和解析信号倾斜角(TAAS)。研究区具有2个低磁异常区和2个高磁异常源的特征,这些高磁异常源位于研究区两大河流的河床和附近。研究区浅层磁异常源位于同一河流的河床及其附近。研究区内的磁源是连通的,几乎是线性的。不同方法鉴定出的几种磁线均有若干优先方向,但以NE-SW、NW-SE、W-E和NE-SW为主。
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引用次数: 0
Analysis of a Large Scale Cold Air Weather Process in China during January 2021 2021年1月中国一次大尺度冷空气天气过程分析
Pub Date : 2023-01-01 DOI: 10.4236/gep.2023.119005
Baojun Wu
This study uses data provided by the National Meteorological Information Center of China, Japan Meteorological Agency (JMA) and National Oceanic Atmospheric Administration (NOAA) Physical Sciences Laboratory of the USA to analyze a cold air weather process at the beginning of January 2021. Synoptic analysis is mainly used to summarize synoptic laws or patterns based on observational data, and describe and infer weather processes. The main conclusions are as follows: The cold air travels south along the northwest path, affecting most of China. During the cold wave process, the first cold air is weak, which has a certain cooling effect on northern China. The second cold air was guided by the low vortex, the accumulation in the transverse groove of Mongolia was strengthened, and the cooling effect was significant. The southwest jet showed an increasing trend, and the water vapor transport conditions were good. However, due to the relatively gentle southern branch system, the warm and humid air flow was weak and the precipitation level was small. The purpose of this study is to better understand a large-scale cold air weather process in January 2021 in China.
本研究利用中国国家气象信息中心、日本气象厅(JMA)和美国国家海洋大气管理局(NOAA)物理科学实验室提供的数据,分析了2021年1月初的一次冷空气天气过程。天气分析主要是根据观测资料总结天气规律或模式,描述和推断天气过程。主要结论如下:冷空气沿西北路径南下,影响了中国大部分地区;在寒潮过程中,第一股冷空气较弱,对华北地区有一定的降温作用。第二次冷空气受低涡引导,蒙古横槽内积累增强,降温效果显著。西南急流呈增加趋势,水汽输送条件良好。但由于南支系统相对温和,暖湿气流偏弱,降水偏少。本研究的目的是更好地了解2021年1月中国大尺度冷空气天气过程。
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引用次数: 0
Remote Sensing Landslide Monitoring Based on Machine Learning Method 基于机器学习方法的滑坡遥感监测
Pub Date : 2023-01-01 DOI: 10.4236/gep.2023.1110008
Zhen Chen, Yiyang Zheng
The susceptibility evaluation of landslides has become one of the key environmental issues that people are concerned about. This study took the land-slides in Xishuangbanna, Yunnan Province as the study object, and selected 10 evaluation factors such as digital elevation model (DEM), slope aspect, precipitation, land use, water system, roads, population density, lithology, faults, and NDVI. Different machine learning methods were compared and studied, and the ROC (receiver operating characteristics) curve verification revealed that the accuracy of the random forest evaluation model was high. In the prediction and evaluation of the susceptibility of landslides, five risk levels were divided. After the superimposed analysis, 87.26% of the disaster points fell in the first and second susceptibility areas. The spot analysis found that the distribution of hot spots is consistent with the distribution of disaster spots. In a word, the results of this study can provide better technical support for the evaluation and early warning of landslides in Southwest China.
滑坡易感性评价已成为人们关注的关键环境问题之一。以云南西双版纳滑坡为研究对象,选取数字高程模型(DEM)、坡向、降水、土地利用、水系、道路、人口密度、岩性、断层、NDVI等10个评价因子。对不同的机器学习方法进行了比较和研究,ROC (receiver operating characteristics)曲线验证表明,随机森林评价模型的准确率较高。在滑坡易感性预测与评价中,划分了5个风险等级。经叠加分析,87.26%的灾害点落在第一易感区和第二易感区。现场分析发现,热点分布与灾点分布一致。研究结果可为西南地区滑坡灾害评价与预警提供较好的技术支持。
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引用次数: 0
Synthesis of Modified Walnut Shell Biochar and Its Performance of Cadmium Adsorption 改性核桃壳生物炭的合成及其对镉的吸附性能
Pub Date : 2023-01-01 DOI: 10.4236/gep.2023.119020
Jiankun Chen, Jianan Wang
Biochar is a functional and environmentally friendly material mainly made from by-products of industrial and agricultural production as raw material, which is cracked at high temperatures and slow speeds. The preparation of biochar requires the thermochemical conversion of biomass in an oxygen-restricted environment. Different raw materials and preparation processes result in biochar with different internal structures and biofunctional groups, which often have different properties. Adsorption of heavy metal pollutants is one of the main research directions for biochar application, and there are still areas that can be improved in the current research for biochar for treating heavy metal wastewater. In this study, we take the treatment of cadmium-containing wastewater as an example, walnut shell biochar (WSBC) as a carrier, iron(VI) compounds as a modifying reagent, and test the performance of cadmium-containing wastewater treatment using simulated cadmium-containing wastewater by adjusting the pyrolysis process and modification method at the same time to find the optimal experimental scheme, and give a reasonable theoretical explanation in relation to the results of the characterization tests, such as SEM, FT-IR, and so on. The characterized results show that iron(VI) compound (K2FeO4)-modified WSBC has a significant ability to remove cadmium contamination in the wastewater (remove 96.62% of cadmium in 1 minute), and its structure is different from other iron compound-modified ones. The aim of this study is to improve the efficiency of cadmium adsorption by specific types of biochar, while realizing the whole process as environmentally friendly as possible.
生物炭是一种主要以工农业生产的副产品为原料,经高温慢速裂解而成的功能性环保材料。生物炭的制备需要在缺氧环境下对生物质进行热化学转化。不同的原料和制备工艺导致生物炭具有不同的内部结构和生物官能团,往往具有不同的性质。对重金属污染物的吸附是生物炭应用的主要研究方向之一,目前生物炭处理重金属废水的研究仍有有待改进的地方。本研究以处理含镉废水为例,以核桃壳生物炭(WSBC)为载体,以铁(VI)化合物为改性剂,通过同时调整热解工艺和改性方法,对模拟含镉废水进行含镉废水处理性能测试,找出最优的实验方案。并对表征测试(如SEM, FT-IR等)的结果给出合理的理论解释。表征结果表明,铁(VI)化合物(K2FeO4)修饰的WSBC对废水中的镉污染具有显著的去除能力(1 min内镉去除率达96.62%),且其结构与其他铁化合物修饰的WSBC不同。本研究的目的是提高特定类型生物炭对镉的吸附效率,同时尽可能实现整个过程的环保。
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引用次数: 0
Characteristic Analysis of Short Time Heavy Rain in Yulin, China 榆林市短时暴雨特征分析
Pub Date : 2023-01-01 DOI: 10.4236/gep.2023.119011
Yiqing Xiao, Qiyuan Hu, Pingyun Li, Jing Yao
National Centers for Environment Prediction (NCEP) reanalysis data, automatic observation data, FY-2E satellite data and Doppler radar data are used to analyze a short-time local heavy rain in Yulin city, Shaanxi, China on August 7, 2018. The result shows that the strong convective weather occurred in peripheral subtropical high over west pacific, being caused by short wave disturbance, and surface convergence lines with positive pressure variation are corresponding to areas of short-time heavy precipitation. The degree of temperature change in cold pool caused by thunderstorm may decide the intensity of a short-time rainfall, and local topography plays an important role in extreme precipitation. Local water vapour accumulation and water vapour flux convergence in the middle and lower layers support adequate moisture condition in the process. Moving direction and development direction of mesocale convective cloud are in a line to develop the train effect, leading to local short-time heavy rain in Yulin city, Shaanxi, China.
利用国家环境预报中心(NCEP)再分析资料、自动观测资料、FY-2E卫星资料和多普勒雷达资料,对2018年8月7日发生在陕西省榆林市的一次短时局地暴雨进行了分析。结果表明,此次强对流天气发生在西太平洋副高外围,由短波扰动引起,具有正压变化的地面辐合线与短时强降水区相对应。雷暴引起的冷池温度变化程度可能决定短时降水的强度,局地地形在极端降水中起重要作用。局地水汽积累和中下层水汽通量辐合为过程提供了充足的水汽条件。中尺度对流云的移动方向和发展方向与发展列车效应呈一条直线,导致陕西省榆林市局地短时强降雨。
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引用次数: 0
Reservoir Characterization of Special Dolomite Rock of Fengcheng Formation in Junggar Basin, China 准噶尔盆地丰城组特殊白云岩储层特征
Pub Date : 2023-01-01 DOI: 10.4236/gep.2023.119021
Famu Huang, Yun Liu, Chenhao Pan, Duocai Wang, Ping Zhang, Yaping Fu, Hong Zhang, Haibo Su, Jun Lu, Zhi Zhong, Bin Wei
Dolomites and eruptive rocks are well-developed in the Permian Fengcheng Formation in Junggar Basin in China, in which oil and gas are accumulated extensively. Until now, high-yield industrial oil and gas flows have been obtained in the dolomitic tuff of the second unit of the Fengcheng Formation, which demonstrates the huge exploration potential of the thick layer of massive dolomitic tuff. The lithology of the second unit of the Fengcheng Formation in this area has gradually transformed from the dolomite, dolomitic tuff to siltstone from east to west. Moreover, the well testing shows that the reservoir is oil-saturated, and the production rate mainly depends on the reservoir’s physical properties and fracture development. In this study, different types of data including core data, well log and seismic data are used cooperatively to characterize the sedimentary, structure and fracture features of the Fengcheng Formation, and then characterize the promising target zone in the study area. The result indicates that hydrocarbons are most accumulated along the deep fault in the Wu-Xia fault zone, which will be the favorable zone for the next progressive exploration.
准噶尔盆地二叠系丰城组白云岩和喷发岩发育,油气富集广泛。迄今为止,丰城组二段白云岩凝灰岩中已获得高产工业油气流,显示了块状白云岩凝灰岩厚层的巨大勘探潜力。本区凤城组二段岩性自东向西由白云岩、白云岩凝灰岩逐渐转变为粉砂岩。试井结果表明,该储层为油饱和储层,产量主要取决于储层物性和裂缝发育情况。通过岩心资料、测井资料、地震资料等不同类型资料的协同应用,对丰城组的沉积、构造、裂缝特征进行了刻画,进而对研究区有潜力的靶区进行了刻画。结果表明,乌夏断裂带深部油气聚集最多,将是下一步进一步勘探的有利带。
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引用次数: 0
Uranium Series Disequilibrium and Precision Measurement of Radionuclides Activity in Sediment Sample Using Low Background Gamma Spectrometry 铀系不平衡及沉积物样品中放射性核素活度的低本底伽马能谱精确测量
Pub Date : 2023-01-01 DOI: 10.4236/gep.2023.1110010
Abdul J. Khan, Umme-Farzana Syed, Amy L. Roselan, Cynthia A. Costello
Low background gamma spectrometry was used to measure the radionuclides activity of 238U, 232Th, and 235U series as well as 40K and 137Cs in a sediment sample. The goal of the study was to measure the 238U (63.3 keV peak of 234Th; 1001 keV peak of 234mPa) and 235U (143.76 keV, 163.33 keV, and 205.31 keV peaks) activity by low background gamma spectrometry in sediment sample. 235U activity in environmental samples is difficult to accurately measure by gamma spectrometry due to its low abundance in nature and low gamma line intensities at 143.76 keV, 163.33 keV, and 205.31 keV. We have shown that by using low background gamma spectrometry, it is possible to accurately measure the 235U activity in sediment samples. The 235U activity was measured without using the major peak of 185.7 keV (Iγ = 57.2%) which requires interference correction from 186.21 keV of 226Ra. 226Ra activity was determined by measuring 222Rn daughters (214Pb and 214Bi). The precision and accuracy of the gamma activity measurement in the sediment sample were verified by using the HPGe detectors with Certified Reference Material (CRM) Irish Sea Sediment (IAEA-385). The results obtained for the 63.33 keV energy line of 234Th are compared with the 1001 keV energy line of 234mPa. The values of 238U and 235U activities, as well as 40K, 137Cs, and 226Ra, agreed with the certificate values of CRM. The results show that the 238U is in equilibrium with its daughters (234Th, 234mPa, and 210Pb). 232Th is also in equilibrium with its daughters (228Ra, 212Pb, 212Bi and 208Tl). 235U/238U activity ratio of 0.046 ± 0.007 in the sediment is constant in nature but fluctuates due to geological processes. A value of 0.055 ± 0.008 was found in our sediment sample.
采用低本底伽马能谱法测定了沉积物样品中238U、232Th和235U系列以及40K和137Cs的放射性核素活度。本研究的目的是测量238U (63.3 keV)峰234;低背景伽马能谱法测定沉积物样品中235U (143.76 keV、163.33 keV和205.31 keV峰)和235U的活度。235U在环境样品中的活性很难用伽马能谱法精确测量,因为它在自然界中丰度低,伽马线强度低,分别为143.76 keV、163.33 keV和205.31 keV。我们已经证明,通过使用低背景伽马能谱法,可以准确地测量沉积物样品中的235U活性。235U活性的测量没有使用185.7 keV的主峰(Iγ = 57.2%),这需要从226Ra的186.21 keV进行干扰校正。226Ra的活性是通过测量222Rn子体(214Pb和214Bi)来测定的。用认证标准物质(CRM)爱尔兰海沉积物(IAEA-385)的HPGe探测器验证了沉积物样品中伽马活度测量的精密度和准确性。并将234号的63.33 keV能量线与234mPa的1001 keV能量线进行了比较。238U、235U活性值,40K、137Cs、226Ra与CRM证书值一致。结果表明,238U与其子原子(234、234mPa和210Pb)处于平衡状态。232Th与其子元素(228Ra, 212Pb, 212Bi和208Tl)也处于平衡状态。沉积物中235U/238U活度比为0.046±0.007,本质上是恒定的,但受地质作用的影响会出现波动。在我们的沉积物样品中发现了0.055±0.008的值。
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引用次数: 0
Impact of Climate Change on Agriculture, Fisheries and Livestock Sectors in Kuwait 气候变化对科威特农业、渔业和畜牧业的影响
Pub Date : 2023-01-01 DOI: 10.4236/gep.2023.1110011
Athari Abdulaziz Almutawa, Abdulrahman Alfraih
The issue of limited agricultural land and production, rising food demand, and heavy reliance on imported foods in Kuwait have resulted in pressing concerns regarding food security and equity. Currently, Kuwait heavily relies on imports for over 90% of its food supply, which not only impacts the country’s sustainability but also affects other nations. Essential staples like rice, wheat, corn, milk powder, cooking oil, and chicken are particularly vulnerable to recent global price shocks. The consequences of climate change include rising temperatures, warming oceans, increasing incidences of droughts, losses in biodiversity, heightened health risks, and a decline in overall food production. These effects further strain an already stressed ecosystem as Kuwait lacks a comprehensive adaptive strategy that outlines both short-term and long-term action plans/goals to address these challenges. Specifically, within the agricultural, livestock, and fisheries sectors while simultaneously equipping it to handle emergencies or hazardous crises. This paper aims to outline the issues of limited agricultural land and production, rising food demand, and heavy reliance on imported foods, and how Kuwait must prioritize the development and improvement of sustainable agricultural practices and technologies. Furthermore, identifying key stakeholders and their current roles and constraints.
科威特有限的农业用地和产量、不断上升的粮食需求以及对进口食品的严重依赖等问题导致了对粮食安全和公平的紧迫关切。目前,科威特90%以上的粮食供应严重依赖进口,这不仅影响了该国的可持续性,也影响了其他国家。大米、小麦、玉米、奶粉、食用油和鸡肉等基本主食尤其容易受到最近全球价格冲击的影响。气候变化的后果包括气温上升、海洋变暖、干旱发生率增加、生物多样性丧失、健康风险增加以及总体粮食产量下降。这些影响进一步加剧了本已紧张的生态系统,因为科威特缺乏全面的适应战略,概述了应对这些挑战的短期和长期行动计划/目标。具体而言,在农业、畜牧业和渔业部门,同时使其具备处理紧急情况或危险危机的能力。本文旨在概述有限的农业用地和生产、不断增长的粮食需求和对进口食品的严重依赖等问题,以及科威特必须如何优先考虑可持续农业实践和技术的发展和改进。此外,确定关键涉众及其当前角色和约束。
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引用次数: 0
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Journal of Geoscience and Environment Protection
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