Vortex initialization for typhoon track prediction     

Trinh Van Thu  T. N. Krishnamurti 《Meteorology and Atmospheric Physics》1992,47(2-4):117-126

Summary A shallow water single level primitive equation model is ideally suited for studying the motion of a tropical cyclone. Three factors seem to be important in the initialization, i.e. the size, intensity and the initial speed and direction of motion of the storm. This study presents the results of sensitivity studies on the above parameters in the definition of a synthetic idealized vortex. The sensitivity studies include results of experimental forecasts for typhoons Betty of 1987 and Dan of 1989. The results of these studies show that the initial size, intensity and direction and speed of motion show considerable sensitivity to the predicted track. Finally a summary of the track forecast errors through 72 hours are presented for these storms.With 8 Figures  相似文献   

Schwermetallbestimmung in Klärwerksschlämmen mittels Röntgenfluoreszenzanalyse     

N. Lucke  B. Wehner  T. Thi Hong Lan  E. Kalla 《洁净——土壤、空气、水》1991,19(3):275-284

The X-ray fluorescence analysis is an important means for the determination of the heavy metal concentrations in sewage sludges and for the evaluation of their usability in agriculture. Analysis devices from the GDR were used for that. For the investigations there was used as the zero sample a sludge which was not loaded with heavy metals, homogeneous and constantly dried at 105 °C. The drying bed sludge samples were treated with different heavy metal solutions with different concentrations. Preparation of samples, measuring conditions and general spectra are described. The measuring results of tests up to 100 g heavy metal in 1 kg dry substance are critically evaluated. The analysis of a sewer sludge sample takes only about ten minutes. There are determined: Cr, Ni, Cu, Zn, Mo, Cd, Hg and Pb.  相似文献   

Bisexual populations of the brine shrimpArtemia in Sète-Villeroy and Villeneuve Saltworks (Languedoc,France)     

Alain Thiéry  Florence Robert 《International Journal of Salt Lake Research》1992,1(1):47-63

So far,Artemia populations in solar saltponds of southern France have been considered as belonging to the Old World parthenogenetic strain. However, two populations sampled monthly in abandoned salinas of Sète-Villeroy and Villeneuve appear to be bisexual throughout their life-cycle. Their sex ratio regularly fluctuates near equilibrium, and mating, present throughout life, is very common in early winter. Morphological characteristics, particularly the male frontal knobs structure, are discussed in relation to the diploid bisexual Mediterranean strain,Artemia tunisiana, which is distributed around the Mediterranean basin. The existence of sexual populations is discussed in regard to variation in environmental conditions in abandoned salinas.  相似文献   

Dealing with Compositional Data: The Freeware CoDaPack   总被引：2，自引：0，他引：2  

S. Thió-Henestrosa  J. A. Martín-Fernández 《Mathematical Geology》2005,37(7):773-793

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Canal-side highway in Ho Chi Minh City (HCMC), Vietnam – Issues of urban cultural conservation and tourism development     

Vu Thi Hong Hanh 《GeoJournal》2006,66(3):165-186

Since the city’s founding back in 1698 on the old Khmer city of Prei Nokor, rivers and canals have always been Ho Chi Minh City’s (HCMC’s) primary means of transportation. Despite the decline of the utilization of the city’s abundant waterways due to the increasing development of modern aerial services and more convenient roads, the HCMC’s canal-based urban form, with its water-based socio-economic structures that include port-boat-market activities and canal handcraft villages, still processes a rich cultural and religious diversity that dates back to the history of the city itself. Currently, developments in the city’s transportation systems are having a damaging impact on the canals’ cultural background. Rather than being recognized as a significant cultural asset that identifies the city, the canal system has been physically reorganized as the city’s drainage system and valued as only a supplementary landscape element; canal communities have been evicted, and canal built fabric has been removed due to recent canal-side transportation developments. To revitalize the urban cultural identity that is possessed by the canal system and to enrich it as a contemporary valuable layer in the city’s dynamic regional development, it is critical to implement cultural conservation and tourism in the development of canal-side transportation and supplementary projects in the canal vicinity.  相似文献   

Gendered access to customary land in East Timor     

Pyone Myat Thu  Steffanie Scott  Kimberly P. Van Niel 《GeoJournal》2007,69(4):239-255

Land tenure rights reflect the deeper structures of society, particularly gender distinctions in relation to land. Considering the structural differences between patrilineal and matrilineal customary tenure systems in East Timor are understudied, this paper explores men and women’s experiences in accessing land under such arrangements. The comparative analysis of two patrilineal with one matrilineal land tenure systems in Ainaro and Manufahi districts suggests a significant degree of flexibility within both systems with respect to the norms of gendered inheritance. Therefore, the binary constructs of ‘patrilineal’ and ‘matrilineal’ societies are limiting. Both men and women in these communities may acquire land rights under different circumstances, mainly through negotiations with their parents or hamlet chief. Daughters in the patrilineal communities could inherit family land upon their parents’ death and sons in the matrilineal community could gain land by cultivating and maintaining unclaimed customary land. Empirical evidence show that inheritance principally determines usufruct rights to land, but marriage exchange practices complicates a deeper understanding of traditional East Timorese land rights.

Pyone Myat ThuEmail:

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Rainfall-induced catastrophic landslide in Quang Tri Province: the deadliest single landslide event in Vietnam in 2020     

Van Tien  Pham  Luong  Le Hong  Duc  Do Minh  Trinh  Phan Trong  Quynh  Dinh Thi  Lan  Nguyen Chau  Thuy  Dang Thi  Phi  Nguyen Quoc  Cuong  Tran Quoc  Dang  Khang  Loi  Doan Huy 《Landslides》2021,18(6):2323-2327

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Evaluation of deep learning algorithms for national scale landslide susceptibility mapping of Iran     

Phuong Thao Thi Ngo  Mahdi Panahi  Khabat Khosravi  Omid Ghorbanzadeh  Narges Kariminejad  Artemi Cerda  Saro Lee 《地学前缘(英文版)》2021,12(2):505-519

The identification of landslide-prone areas is an essential step in landslide hazard assessment and mitigation of landslide-related losses.In this study,we applied two novel deep learning algorithms,the recurrent neural network(RNN)and convolutional neural network(CNN),for national-scale landslide susceptibility mapping of Iran.We prepared a dataset comprising 4069 historical landslide locations and 11 conditioning factors(altitude,slope degree,profile curvature,distance to river,aspect,plan curvature,distance to road,distance to fault,rainfall,geology and land-sue)to construct a geospatial database and divided the data into the training and the testing dataset.We then developed RNN and CNN algorithms to generate landslide susceptibility maps of Iran using the training dataset.We calculated the receiver operating characteristic(ROC)curve and used the area under the curve(AUC)for the quantitative evaluation of the landslide susceptibility maps using the testing dataset.Better performance in both the training and testing phases was provided by the RNN algorithm(AUC=0.88)than by the CNN algorithm(AUC=0.85).Finally,we calculated areas of susceptibility for each province and found that 6%and 14%of the land area of Iran is very highly and highly susceptible to future landslide events,respectively,with the highest susceptibility in Chaharmahal and Bakhtiari Province(33.8%).About 31%of cities of Iran are located in areas with high and very high landslide susceptibility.The results of the present study will be useful for the development of landslide hazard mitigation strategies.  相似文献   

GIS-based landslide susceptibility modeling: A comparison between fuzzy multi-criteria and machine learning algorithms     

Sk Ajim Ali  Farhana Parvin  Jana Vojteková  Romulus Costache  Nguyen Thi Thuy Linh  Quoc Bao Pham  Matej Vojtek  Ljubomir Gigović  Ateeque Ahmad  Mohammad Ali Ghorbani 《地学前缘(英文版)》2021,12(2):857-876

Hazards and disasters have always negative impacts on the way of life.Landslide is an overwhelming natural as well as man-made disaster that causes loss of natural resources and human properties throughout theworld.The present study aimed to assess and compare the prediction efficiency of different models in landslide susceptibility in the Kysuca river basin,Slovakia.In this regard,the fuzzy decision-making trial and evaluation laboratory combining with the analytic network process(FDEMATEL-ANP),Na?ve Bayes(NB)classifier,and random forest(RF)classifier were considered.Initially,a landslide inventory map was produced with 2000 landslide and nonlandslide points by randomly dividedwith a ratio of 70%:30%for training and testing,respectively.The geospatial database for assessing the landslide susceptibility was generated with the help of 16 landslide conditioning factors by allowing for topographical,hydrological,lithological,and land cover factors.The ReliefF methodwas considered for determining the significance of selected conditioning factors and inclusion in the model building.Consequently,the landslide susceptibility maps(LSMs)were generated using the FDEMATEL-ANP,Na?ve Bayes(NB)classifier,and random forest(RF)classifier models.Finally,the area under curve(AUC)and different arithmetic evaluation were used for validating and comparing the results and models.The results revealed that random forest(RF)classifier is a promising and optimum model for landslide susceptibility in the study area with a very high value of area under curve(AUC=0.954),lower value of mean absolute error(MAE=0.1238)and root mean square error(RMSE=0.2555),and higher value of Kappa index(K=0.8435)and overall accuracy(OAC=92.2%).  相似文献   

Credibility of design rainfall estimates for drainage infrastructures: extent of disregard in Nigeria and proposed framework for practice     

Aiyelokun  Oluwatobi  Pham  Quoc Bao  Aiyelokun  Oluwafunbi  Malik  Anurag  Adarsh  S.  Mohammadi  Babak  Linh  Nguyen Thi Thuy  Zakwan  Mohammad 《Natural Hazards》2021,109(2):1557-1588

Natural Hazards - Rainfall intensity or depth estimates are vital input for hydrologic and hydraulic models used in designing drainage infrastructures. Unfortunately, these estimates are...  相似文献