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Daily streamflow forecasting by machine learning in Tra Khuc river in Vietnam 越南Tra Khuc河的机器学习日流量预测
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-12-02 DOI: 10.15625/2615-9783/17914
Huu Duy Nguyen
Precise streamflow prediction is crucial in the optimization of the distribution of water resources. This study develops the machine learning models by integrating recurrent gate unit (GRU) with bacterial foraging optimization (BFO), gray wolf optimizer (GWO), and human group optimization (HGO) to forecast the streamflow in the Tra Khuc River, Vietnam. For this purpose, the time series of daily rainfall and river flow at Son Giang station from 2000 to 2020 were employed to forecast the streamflow. The statistical indices, namely the root mean square error, the mean absolute error, and the coefficient of determination (R²), was utilized to evaluate the performance of the proposed models. The results showed that the three optimization algorithms (HGO, GWO, and BFO) effectively enhanced the performance of the GRU model. Moreover, among the four models (GRU, GRU-HGO, GRU-GWO, and GRU-BFO), the GRU-GWO model outperformed the other models with R² = 0.883. GRU-HGO achieved R² = 0.879, and GRU-BFO achieved R²=0.878. The results of this study showed that GRU combined with optimization algorithms is a reliable modeling approach in short-term flow forecasting.
精确的流量预测是水资源优化配置的关键。本研究将循环门单元(GRU)与细菌觅食优化(BFO)、灰狼优化(GWO)和人类群体优化(HGO)相结合,建立了机器学习模型,用于预测越南特拉胡克河的流量。为此,利用2000 - 2020年孙江站日降雨量和河流量时间序列对河流流量进行预报。采用均方根误差、平均绝对误差和决定系数(R²)等统计指标评价模型的性能。结果表明,三种优化算法(HGO、GWO和BFO)有效地增强了GRU模型的性能。在GRU、GRU- hgo、GRU- gwo、GRU- bfo四种模型中,GRU- gwo模型的表现优于其他模型,R²= 0.883。GRU-HGO达到R²= 0.879,GRU-BFO达到R²=0.878。研究结果表明,GRU结合优化算法是一种可靠的短期流量预测建模方法。
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引用次数: 1
Numerical modelling of slope stabilization with xathan gum-treated soil 沙山胶处理土边坡稳定的数值模拟
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-12-02 DOI: 10.15625/2615-9783/17924
An Tran Thi Phuong, Chang Ilhan, Nhan Tran Thanh, Cho Gye-Chun
Biopolymer soil treatment has been introduced as the latest technological innovation in soil stabilization and improvement. Biopolymers with agar, guar, xanthan, casein, gellan and sodium alginate have been commonly studied to improve strength, reduce hydraulic conductivity and prevent erosion of highly permeable soil materials. Among those, xanthan gum is introduced to perform better in terms of lowering permeability. In this study, the effect of xanthan gum on slope stability under rainfall was evaluated via a 2D finite-difference program (FLAC) considering the wetting behavior of xanthan gum-treated soil. In order to obtain input parameters for numerical modelling, wetting soil-water characteristic tests, permeability tests, and direct shear tests were conducted on xanthan gum-treated soils. The numerical results support the application of biopolymers to soil erosion control during rainfall, mainly due to the significant decrease in the infiltration of xanthan gum-treated soil.
生物聚合物土壤处理是土壤稳定和改良方面的最新技术创新。含有琼脂、瓜尔胶、黄原胶、酪蛋白、结冷胶和藻酸钠的生物聚合物已被广泛研究,以提高强度、降低导水性并防止高渗透性土壤材料的侵蚀。其中,引入黄原胶在降低渗透性方面表现更好。在本研究中,考虑到黄原胶处理土壤的润湿行为,通过二维有限差分程序(FLAC)评估了黄原胶对降雨条件下边坡稳定性的影响。为了获得数值模拟的输入参数,在黄原胶处理的土壤上进行了润湿土-水特性试验、渗透性试验和直剪试验。数值结果支持生物聚合物在降雨期间用于土壤侵蚀控制,这主要是因为黄原胶处理的土壤渗透显著减少。
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引用次数: 0
Magnetotellurics study of Atambua area, West Timor, Indonesia 印度尼西亚西帝汶阿坦布瓦地区大地电磁学研究
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-10-13 DOI: 10.15625/2615-9783/17581
Edy Wijanarko, I. Arisbaya, P. Sumintadireja, Warsa, H. Grandis
Timor Island, located in the eastern Indonesian archipelago, has a complex tectonic evolution causing complex geological structures. Many hypothetical tectonic models are proposed mainly based on regional geological and geophysical data. Available geophysical data to support geological study at a more detailed scale are still very limited. Therefore, this study aimed to map the sub-regional subsurface geology in Atambua, West Timor, and its surroundings by using the magnetotelluric (MT) method. The estimated geo-electrical strike direction from the phase tensor analysis confirmed the regional Southwest - Northeast general structural orientation. The dimensionality analysis also showed the validity for 2D approximation in that direction. The subsurface resistivity models from 2D inversion of the MT data at representative lines perpendicular to the regional structural direction delineate the primary sequences and their boundaries from their resistivities. They are, from top to bottom, Viqueque and Bobonaro sequences, Kolbano sequence, Kekneno sequence, and the basement dominated by rocks with Australian affinity. These main rock formations represent the regional sedimentary depositional fill resulting from the major tectonic events on Timor Island.  
帝汶岛位于印尼群岛东部,构造演化复杂,地质构造复杂。提出了许多基于区域地质和地球物理资料的假设构造模型。支持更详细的地质研究的现有地球物理数据仍然非常有限。因此,本研究旨在利用大地电磁(MT)方法绘制西帝汶阿坦布瓦及其周边地区的次区域地下地质图谱。根据相张量分析估计的地电走向,确定了该地区的总体构造走向为西南—东北。维数分析也显示了二维近似在该方向上的有效性。在垂直于区域构造方向的代表性线上对大地电磁法资料进行二维反演的地下电阻率模型,通过电阻率来圈定原生层序及其边界。从上到下依次为:Viqueque和Bobonaro层序、Kolbano层序、Kekneno层序和以澳洲亲和岩为主的基底。这些主要岩层代表了帝汶岛主要构造事件造成的区域性沉积堆积。
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引用次数: 1
Effects of physical properties and undrained cyclic shear conditions on the pore water pressure responses of saturated sands and clays 物性和不排水循环剪切条件对饱和砂和粘土孔隙水压力响应的影响
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-10-10 DOI: 10.15625/2615-9783/17568
Nhan Tran Thanh, H. Matsuda, An Tran Thi Phuong, Nhan Nguyen Thi Thanh, Tien Pham Van, Thien Do Quang
For clarifying the effects of relative density (Dr) and Atterberg’s limits on the cyclic shear-induced pore water pressure properties of soils, sandy soils with similar index properties and clayey soils with different Atteberg’s limits were collected from Vietnam and Japan and used for this study. Specimens at Dr = 50% of Nam O sand and Dr = 70% of Toyoura sand, and those of Hue clay and Japanese Kaolin clay were consolidated under the vertical stress of σvo = 49 kPa. They were then subjected to undrained cyclic shear for various cyclic shear directions and wide ranges of the number of cycles and shear strain amplitudes. Under the same cyclic shearing conditions, specimens of sand at higher Dr (Toyoura sand) and clay with higher Atterberg’s limits (Kaolin) show a lower pore water pressure ratio. The number of cycles and the cumulative shear strain at the starting point of pore water pressure generation were observed for different soils and testing conditions. In addition, using the cumulative shear strain, a new strain path parameter, the effects of shear strain amplitude and cyclic shear direction can be captured, resulting in a unique uacc/σ’vo - G*  relation on each soil. Based on this, fitting lines can be drawn and referred to promote a prediction of the cyclic shear-induced pore water pressure accumulation for the used soils under different cyclic shear conditions.
为了阐明相对密度(Dr)和阿氏极限对土壤循环剪切引起的孔隙水压力特性的影响,从越南和日本收集了具有相似指数特性的砂土和具有不同阿氏极限的粘性土,并将其用于本研究。在σvo=49kPa的垂直应力下,对Dr=50%的Nam O砂和Dr=70%的Toyura砂以及Hue粘土和日本高岭土的试样进行固结。然后,对它们进行不同循环剪切方向和宽范围的循环次数和剪切应变振幅的不排水循环剪切。在相同的循环剪切条件下,Dr较高的砂(Toyura砂)和Atterberg极限较高的粘土(高岭土)试样的孔隙水压力比较低。在不同的土壤和试验条件下,观察了孔隙水压力产生起始点的循环次数和累积剪切应变。此外,使用累积剪切应变这一新的应变路径参数,可以捕捉剪切应变幅度和循环剪切方向的影响,从而在每种土壤上产生独特的uacc/σ'vo-G*关系。基于此,可以绘制和参考拟合线,以促进对不同循环剪切条件下所用土壤的循环剪切引起的孔隙水压力累积的预测。
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引用次数: 1
Establishment of the correlation between the near-surface sedimentary thickness and the microtremor dominant frequency in the Hanoi area 河内地区近地表沉积厚度与微地震主频关系的建立
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-10-10 DOI: 10.15625/2615-9783/17569
Hung Nguyen-Tien, P. Nguyen-Hong, Minh-Tri Nguyen-Le, L. Che-Min, Nguyen Tran-An, Truyen Pham-The, Duong Nguyen-Van
 This paper established the correlation between the near-surface sedimentary thickness (D) and the microtremor dominant frequency (F0) in the Hanoi area based on 64 microtremor measuring points at the boreholes with depth to bedrock. The microtremor dominant frequency was determined using the horizontal-to-vertical (H/V) spectral ratio of the seismic noise technique proposed by Nakamura (1989). The near-surface sedimentary thickness was determined according to the borehole data from the previously published reports. The non-linear regression method was applied to the pairs of D and F0 values from 64 boreholes to obtain the relationship of form D = 81.851*F0-0.942. This correlation function was used to determine the values of the near-surface sedimentary thickness at microtremor measurement points according to the F0 values. Comparison of the D-values obtained in this study with those from the boreholes data shows good coincidence by values and variation tendency, especially in areas with shallow cover thickness from 50 to 100 m. The above results allow the proposal of a new near-surface sedimentary thickness determination technique in the Hanoi area.
本文基于距基岩较深钻孔的64个微地震测点,建立了河内地区近地表沉积厚度(D)与微地震主频(F0)之间的相关性。使用Nakamura(1989)提出的地震噪声技术的水平与垂直(H/V)频谱比来确定微地震主频。近地表沉积厚度是根据先前发表的报告中的钻孔数据确定的。将非线性回归方法应用于64个钻孔的D和F0值对,得到D=81.851*F0-0.942的关系。该相关函数用于根据F0值确定微地震测量点的近地表沉积厚度值。本研究中获得的D值与钻孔数据的D值的比较表明,这些值和变化趋势具有良好的一致性,尤其是在浅覆盖层厚度为50至100 m的地区。上述结果为河内地区提出一种新的近地表沉积厚度测定技术提供了依据。
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引用次数: 0
Ionospheric quasi-biennial oscillation of the TEC amplitude of the equatorial ionization anomaly crests from continuous GPS data in the Southeast Asian region 东南亚地区赤道电离异常TEC振幅的电离层准两年振荡
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-09-05 DOI: 10.15625/2615-9783/17490
Dung Nguyen Thanh, M. Huy, C. Amory-Mazaudier, R. Fleury, S. Saito, Thang Nguyen Chien, T. L. Truong, H. P. Thu, T. N. Ha, Mai Nguyen Thi, Que Le
The quasi-biennial oscillation (QBO) signals at two Equatorial ionization anomaly (EIA) crests of the ionosphere have been studied using the continuous GNSS network data in Vietnam and adjacent regions during the 2008- 2021 period. The monthly mean EIA crests amplitudes are calculated. The Lomb-Scargle periodogram method was applied to the residuals of the EIA crests magnitudes, DTEC, which are obtained from subtracting the fittings with solar index, F10.7. The Lomb-Scargle spectrum shows the quasi-biennial component in the residuals DTEC with the picks at 18, 25, and 29-30 months. The ionosphere QBO at two EIA crests was found out by the band-pass filter centered at 25 months with haft-power points at 17 and 33 months. The zonal wind data at 50 hPa (~ 20 km) of the tropical equatorial stratosphere is used as the stratosphere QBO (SQBO) to consider the relationship between the SQBO and the obtained ionosphere QBO. The direct comparison and the cross wavelet transform of the SQBO and ionosphere QBO data series show that during 2008-2009, the ionosphere QBO signal is low, the SQBO and ionosphere QBO are in phase during the 2010-2013 and 2018-2021 periods, but anti-phase during the 2014-2017 period. For the 2010-2013, 2014-2017 and 2018-2021 periods, the correlation coefficients are 0.623, 0.637, -0.646 in the northern crest, and 0.571, 0.53, -0.530 in the southern crest, respectively. Furthermore, we also observed that the SQBO and the ionosphere QBO signals were shortened during the 2015-2016 period, approximately 1.5 years. Previous studies showed that the ENSO (El Niño - Southern Oscillation) warm phase, also known as El-Niño existed during 2015-2016. The results of this study allow us to assume that the SQBO influences the ionosphere QBO. Our results show that the SQBO is the main factor affecting the ionospheric QBO at two EIA crests. However, the physical theoretical interpretation of the mechanisms of action is a challenge for scientists and requires further research.
利用2008-2011年期间越南及邻近地区的连续GNSS网络数据,研究了电离层赤道电离异常(EIA)两个波峰的准两年振荡(QBO)信号。计算月平均EIA峰值振幅。将Lomb Scargle周期图方法应用于EIA峰值震级DTEC的残差,该残差是通过减去与太阳指数F10.7的拟合而获得的。Lom-Scargle谱显示了残差DTEC中的准两年期成分,其pick分别为18、25和29-30个月。以25个月为中心,轴功率点分别为17和33个月的带通滤波器发现了两个EIA峰值处的电离层QBO。使用热带赤道平流层50 hPa(~20 km)的纬向风数据作为平流层QBO(SQBO),以考虑SQBO与所获得的电离层QBO之间的关系。通过对SQBO和电离层QBO数据序列的直接比较和交叉小波变换表明,2008-2009年期间,电离层QBO信号较低,2010-2013年和2018-2021年期间SQBO与电离层QBO同相,2014-2017年期间相反。2010-2013年、2014-2017年和2018-2021年期间,北部波峰的相关系数分别为0.623、0.637和-0.646,南部波峰的相关性系数分别为0.571、0.53和-0.530。此外,我们还观察到,在2015-2016年期间,SQBO和电离层QBO信号缩短了约1.5年。先前的研究表明,2015年至2016年期间存在ENSO(厄尔尼诺-南方涛动)暖期,也称为厄尔尼诺。本研究的结果使我们能够假设SQBO影响电离层QBO。结果表明,SQBO是影响两个EIA峰电离层QBO的主要因素。然而,对作用机制的物理理论解释对科学家来说是一个挑战,需要进一步研究。
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引用次数: 0
Microplastics in the Surface Sediment of the main Red River Estuary 红河主要河口表层沉积物中的微塑料
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-09-05 DOI: 10.15625/2615-9783/17486
N. Le, Thi Thu Hang Hoang, T. Duong, N. Phuong, P. Le, T. Nguyen, T. X. B. Phung, Thi My Hanh Le, Thi Lien Le, T. Vu, T. Le
Microplastics (< 5mm) are one emerging pollutant in the environment. These are the threats and challenges facing the global environment, economy, and society, especially in hotspot regions such as Asia. This paper presents the microplastic characteristics found in the surface sediment of the main Red River estuary (the Ba Lat) during four separate monitoring runs in 2020. The microplastic amount in the sediment samples varied from 800 items per kg of dried weight (dw) to 3,817 items.kg-1 dw, averaging 2,188 ± 1,499 items.kg-1 dw. Fiber and fragment microplastics were discovered to be primary shapes, of which fibers dominated (94%). Microplastic fiber sizes were found mainly in the < 500 µm (69%) range. The most primarily observed colors of microplastics were blue (36%), white (21%), and red (11%). There were five recognized polymer types (polypropylene (PP), polyethylene (PE), polyurethane (PU), polyamide (PA), and polystyrene (PS)) in the sediment samples, with PE and PP predominating. Seasonal fluctuations in microplastic concentrations at the Ba Lat site, a significant aquaculture zone, may indicate the contribution of multiple sources. Our research demonstrated the necessity of microplastic observation in organisms, particularly in the aquaculture zones in Vietnam. Our findings further underline the importance of managing and minimizing the amount of plastic garbage that enters the ecosystem.
微塑料(< 5mm)是一种新兴的环境污染物。这些都是全球环境、经济和社会面临的威胁和挑战,特别是在亚洲等热点地区。本文介绍了2020年4次监测中红河河口(巴拉特)表层沉积物的微塑性特征。沉积物样品中的微塑料含量从每公斤干重800个到3817个不等。kg- 1dw,平均2188±1499项。公斤dw。发现纤维和碎片微塑料是主要的形状,其中纤维占主导地位(94%)。微塑料纤维尺寸主要在< 500µm(69%)范围内。微塑料最主要的颜色是蓝色(36%)、白色(21%)和红色(11%)。沉积物样品中已知的聚合物类型有聚丙烯(PP)、聚乙烯(PE)、聚氨酯(PU)、聚酰胺(PA)和聚苯乙烯(PS) 5种,以PE和PP为主。巴拉特是一个重要的水产养殖区,其微塑料浓度的季节性波动可能表明多种来源的贡献。我们的研究证明了对生物体进行微塑性观察的必要性,特别是在越南的水产养殖区。我们的研究结果进一步强调了管理和减少进入生态系统的塑料垃圾数量的重要性。
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引用次数: 1
Assessment of machine learning techniques for prediction of integrated water vapor using meteorological data 利用气象资料预测综合水汽的机器学习技术评估
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-07-29 DOI: 10.15625/2615-9783/17373
Nirmala Bai Jadala, M. Sridhar, D. Venkata Ratnam, G. Dutta
Weather and Climatological studies are very important in assessing atmospheric conditions like storms and cyclones. Integrated water vapor (IWV) is an important greenhouse gas in the atmosphere responsible for the Earth's radiative balance. Global Positioning System (GPS) observations have been used for monitoring the IWV variability.  The IWV estimations are carried out using ground-based GPS observations at Hyderabad (17.4°N, 78.46°E), India using GAMIT software. GAMIT is GPS analysis software developed by MIT, USA. It takes input as GPS observation data containing pseudo ranges, navigation data containing ephemeris, clock errors, g-files with orbital information, and meteorological data like pressure, temperature, and relative humidity to calculate IWV. However, estimating IWV for forecasting applications is impossible with a GPS system. This paper introduces a methodology to predict IWV during normal days and severe cyclonic events using machine learning (ML) techniques. Rational quadratic Gaussian process regression (RQ-GPR) and neural network (NN) algorithms are considered for identifying suitable ML prediction algorithms over tropical conditions. Meteorological surface data like Pressure, Temperature, and relative humidity are given as input to the machine learning models. The IWV values computed from GPS are compared with the model's predicted values. RQ-GPR model is showing good accuracy with the IWV values computed from GPS against the NN model. The correlation coefficient (ρ) achieved for RQ-GPR is 0.93, and 0.86 is obtained for the NN model. The RMSE (Root Mean Square Error) of the predicted IWV value with RQ-GPR is better than the NN model. We have obtained mean square error (MSE) and mean absolute error (MAE) as 18.146 kg/m2 and 3.0762 kg/m2 for RQ-GPR and 27.509 kg/m2 and 3.9102 kg/m2 for the NN model which is showing RQ-GPR is a suitable model for forecasting applications. The HUDHUD cyclonic event that occurred in October 2014 is considered for testing the proposed ML algorithms. RQ-GPR model has better results in the Prediction of IWV than the NN model. The RMSE value obtained is 2.837 kg/m2 for RQ-GPR and 3.327 kg/m2 obtained from the NN model. The results indicate that the RQ-GPR model has more accuracy than the other IWV prediction models. The prediction results are helpful for meteorology, weather, and climatology studies and useful to improve the accuracy of the regional numerical weather prediction models.
天气和气候学研究对于评估风暴和气旋等大气条件非常重要。综合水蒸气(IWV)是大气中重要的温室气体,负责地球的辐射平衡。全球定位系统(GPS)观测已被用于监测IWV的变化。利用GAMIT软件,利用印度海得拉巴(17.4°N, 78.46°E)的地面GPS观测资料进行IWV估算。GAMIT是美国麻省理工学院开发的GPS分析软件。输入包含伪距离的GPS观测数据、包含星历、时钟误差的导航数据、包含轨道信息的g文件以及气压、温度、相对湿度等气象数据来计算IWV。然而,用GPS系统估计预报应用的IWV是不可能的。本文介绍了一种利用机器学习(ML)技术预测正常天气和严重气旋事件期间IWV的方法。考虑了有理二次高斯过程回归(RQ-GPR)和神经网络(NN)算法来确定热带条件下合适的ML预测算法。气压、温度和相对湿度等地表气象数据被作为输入输入到机器学习模型中。将GPS计算的IWV值与模型预测值进行了比较。RQ-GPR模型用GPS计算的IWV值与NN模型对比,显示出较好的精度。RQ-GPR模型的相关系数ρ为0.93,NN模型的相关系数ρ为0.86。RQ-GPR预测的IWV值的RMSE(均方根误差)优于NN模型。我们得到了RQ-GPR的均方误差(MSE)和平均绝对误差(MAE)分别为18.146 kg/m2和3.0762 kg/m2,而NN模型的均方误差(MSE)和平均绝对误差(MAE)分别为27.509 kg/m2和3.9102 kg/m2,这表明RQ-GPR是一种适合预测应用的模型。2014年10月发生的HUDHUD气旋事件被考虑用于测试提议的ML算法。RQ-GPR模型对IWV的预测效果优于NN模型。RQ-GPR模型的RMSE值为2.837 kg/m2, NN模型的RMSE值为3.327 kg/m2。结果表明,RQ-GPR模型比其他IWV预测模型具有更高的精度。预报结果对气象学、天气学和气候学的研究有一定的参考价值,对提高区域数值天气预报模式的精度也有一定的参考价值。
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引用次数: 1
Comprehensive assessment of coastal tourism potential in Vietnam 越南沿海旅游潜力综合评估
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-07-29 DOI: 10.15625/2615-9783/17374
Huong Hoang Thi Thu, Bac Kinh Dang, A. van Rompaey
Coastal tourism includes diverse resources and activities, so a comprehensive assessment is required to implement the sensible use of tourism potential. This paper deals with a comprehensive assessment of tourism potential in the coastal region of Vietnam based on 4 dimensions: attractiveness, accessibility, tourism service quality, and environmental quality & safety, covering 23 criteria. Analysis Hierarchy Process (AHP), Principal Component Analysis (PCA), Correlation analysis, and a Geographic Information System (GIS) were used in this study. AHP was applied to determine a weighting coefficient for each criterion. PCA was processed next to AHP, allowing a combination of the considered sites' internal and external tourism potentials. Then the relationship between tourism potential and revenue is tested based on correlation analysis. The results show that the provinces in the South-Central region have the highest potential for coastal tourism development, followed by the North Central region. The Northern and Southeast region provinces and Mekong River Delta have low potential. However, there are still some bright spots for coastal tourism development in these regions, such as Quang Ninh, Ho Chi Minh City, Ba Ria-Vung Tau, and Kien Giang. This research also shows that tourism revenue depends more on external factors (supporting factors) than internal factors (tourism resources). Finally, the study proposed development plans for each group of coastal provinces based on their strengths and weaknesses, as well as suggested solutions to overcome the limitations of seasonality and the impact of climate change on Vietnam's coastal tourism.
沿海旅游包括多种资源和活动,因此需要进行全面评估,以合理利用旅游潜力。本文基于吸引力、可及性、旅游服务质量和环境质量与安全4个维度,涵盖23个标准,对越南沿海地区的旅游潜力进行了综合评估。本研究采用层次分析法(AHP)、主成分分析法(PCA)、相关分析法和地理信息系统(GIS)。应用层次分析法来确定每个标准的加权系数。PCA是在AHP之后处理的,允许将所考虑的景点的内部和外部旅游潜力相结合。然后在相关分析的基础上检验了旅游潜力与收入之间的关系。结果表明,中南部地区的省份具有最高的沿海旅游发展潜力,其次是中北部地区。北部和东南部地区省份以及湄公河三角洲的潜力较低。然而,这些地区的沿海旅游业发展仍有一些亮点,如广宁、胡志明市、八里头顿和建江。这项研究还表明,旅游收入更多地取决于外部因素(支持因素),而不是内部因素(旅游资源)。最后,该研究根据每组沿海省份的优势和劣势提出了发展计划,并提出了克服季节性限制和气候变化对越南沿海旅游业影响的解决方案。
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引用次数: 2
Surface ruptures and land deformation from the 21 June 2022 Afghanistan earthquake 2022年6月21日阿富汗地震造成的地表破裂和土地变形
IF 1.5 Q2 Earth and Planetary Sciences Pub Date : 2022-07-04 DOI: 10.15625/2615-9783/17258
Khac Dang Vu, Trinh Phan Trong, P. Tapponnier
The 2022 Afghanistan earthquake occurred at the border between Afghanistan and Pakistan at 20:54:36 (UTC) on June 21, 2022. According to the USGS, the earthquake caused vibrations with a magnitude of 5.9, a hypocenter located at a depth of 10 km, and an epicenter at 33,092°N, 69,514°E.  According to European Civil Protection and Humanitarian Aid Operations, this event resulted in disaster for human beings 1039 people died, 2949 people were injured, and damaged to homes and infrastructures of 4500 houses were partially or fully destroyed across Paktika and Khost provinces. It is necessary to improve the knowledge of this phenomenon. On the one hand, it is essential to quickly determine the extent of the affected area to provide timely relief services. On the other hand, it is necessary to determine the deformation characteristics of the fractured zone caused by earthquakes to minimize future damages. Conventional DInSAR technique applied to two images captured on June 18, 2022, and June 30, 2022, respectively, before and after the earthquake event shows the fractured zone with a maximum displacement of 78.4 cm, which locates on the left side of the previously identified northeast–southwest fault. The location of this zone is 15 km in the southward direction of the earthquake epicenter. The interferometric fringes show that a large area to the East of the study area is displaced in comparison to the original position. However, its Northwest region, which corresponds to the Paleogene formations, is much less affected by earthquakes. The earthquake occurred along a left lateral strike-slip fault in the plate boundary between India and Eurasia plates at the Northwestern margin of the collision.
2022年阿富汗地震于2022年6月21日20:54:36(UTC)发生在阿富汗和巴基斯坦边境。据美国地质调查局称,此次地震造成5.9级振动,震源位于10公里深处,震中位于33092°N,69514°E。据欧洲公民保护和人道主义援助行动称,这一事件造成了人类灾难,帕克蒂卡省和霍斯特省1039人死亡,2949人受伤,房屋受损,4500栋房屋的基础设施部分或全部被毁。有必要提高对这一现象的认识。一方面,必须迅速确定受灾地区的范围,以便及时提供救援服务。另一方面,有必要确定地震引起的断裂带的变形特征,以最大限度地减少未来的破坏。传统的DInSAR技术分别应用于2022年6月18日和6月30日地震前后拍摄的两张图像,显示了最大位移为78.4 cm的断裂带,位于先前确定的东北-西南断层的左侧。该地带位于震中向南15公里处。干涉条纹显示,与原始位置相比,研究区域以东的大片区域发生了位移。然而,与古近系地层相对应的西北地区受地震的影响要小得多。地震发生在印度和欧亚大陆板块边界碰撞西北边缘的左侧走滑断层上。
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引用次数: 1
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VIETNAM JOURNAL OF EARTH SCIENCES
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