排序方式： 共有6条查询结果，搜索用时 46 毫秒
1
1.
In recent years,landslide susceptibility mapping has substantially improved with advances in machine learning.However,there are still challenges remain in landslide mapping due to the availability of limited inventory data.In this paper,a novel method that improves the performance of machine learning techniques is presented.The proposed method creates synthetic inventory data using Generative Adversarial Networks(GANs)for improving the prediction of landslides.In this research,landslide inventory data of 156 landslide locations were identified in Cameron Highlands,Malaysia,taken from previous projects the authors worked on.Elevation,slope,aspect,plan curvature,profile curvature,total curvature,lithology,land use and land cover(LULC),distance to the road,distance to the river,stream power index(SPI),sediment transport index(STI),terrain roughness index(TRI),topographic wetness index(TWI)and vegetation density are geo-environmental factors considered in this study based on suggestions from previous works on Cameron Highlands.To show the capability of GANs in improving landslide prediction models,this study tests the proposed GAN model with benchmark models namely Artificial Neural Network(ANN),Support Vector Machine(SVM),Decision Trees(DT),Random Forest(RF)and Bagging ensemble models with ANN and SVM models.These models were validated using the area under the receiver operating characteristic curve(AUROC).The DT,RF,SVM,ANN and Bagging ensemble could achieve the AUROC values of(0.90,0.94,0.86,0.69 and 0.82)for the training;and the AUROC of(0.76,0.81,0.85,0.72 and 0.75)for the test,subsequently.When using additional samples,the same models achieved the AUROC values of(0.92,0.94,0.88,0.75 and 0.84)for the training and(0.78,0.82,0.82,0.78 and 0.80)for the test,respectively.Using the additional samples improved the test accuracy of all the models except SVM.As a result,in data-scarce environments,this research showed that utilizing GANs to generate supplementary samples is promising because it can improve the predictive capability of common landslide prediction models. 相似文献
2.
Litter was assessed on three beaches along the Jordanian coast of the Gulf of Aqaba, south of the town Aqaba, monthly during 1994 and 1995, in order to determine its nature, extent and possible sources. The overall mean was about 5 and 3 items/m(2) in 1994 and 1995, respectively. Approximately a total of 14,000 m(2) were examined and a total of 101,000 items were noted, 67,000 during 1994 and 34,000 in 1995. More than 50% of the litter was plastic and the remainder wood, glass, cardboard, Styrofoam, metal and other materials. Most litter appears to be from local land-based or near shore sources, although there are some regional influences as well. The main local sources are the passenger port, the cargo port and the beach goers. The findings are compared with other regions of the world. The amount of litter is related to distance of the beach from the main sources, and shape, physiography and orientation of the beach. Spatial and seasonal variations are examined and discussed, and actions and measures to combat the problem on local and regional levels are suggested. 相似文献
3.
Al-Zibdah Mohammad Oqaily Firas Al-Najjar Tariq Manasrah Riyad 《Ocean Science Journal》2008,43(1):9-16
Environmental qualities of coastal water and bottom sediment were assessed at Jordan's northernmost tip of Gulf of Aqaba to
evaluate possible impacts of the bordering fish pen cages in Eilat. Results showed significant differences between surface
and bottom water in the chemical and physical variables in the different months of the year (2004-2005). Chlorophyll a was
also significantly higher in bottom water when compared to that of the offshore water. Nitrate and ammonia were significantly
higher in bottom water than the surface water at each individual station. The upper 2 cm of sediment sample recorded higher
values of total phosphorus and organic matter. Seasonality affected the content of total phosphorus, organic matter, redox
potential and color especially at the sediment layer below 3 cm of the sediment core. The present investigation showed slight
modification of water and sediment qualities but no clear sign of eutrophication was observed. However, to maintain sustainability
of healthy environmental conditions at the northern tip of Gulf of Aqaba potentials of any possible environmental risks arising
from the fish farms or any other coastal investment should be carefully considered. 相似文献
4.
Riyad Manasrah Mohammad Zibdah Firas Al-Ougaily Najim Yusuf Tariq Al-Najjar 《Ocean Science Journal》2007,42(2):103-116
Seasonal changes of tide signal(s), temperature, salinity and current were studied during the years 2004-2005 in the northernmost
Gulf of Aqaba, which is under developmental activities, to obtain scientific bases for best management and sustainability.
Spectrum analysis revealed permanent signals of tide measurements during all seasons, which represented semidiurnal and diurnal
barotropic tides. The other signal periods of 8.13, 6.10-6.32, 4.16 and 1.02-1.05 h were not detected in all seasons, which
were related to shallow water compound and overtides of principle solar and lunar constituent and to seiches generated in
the Red Sea and the Gulf of Aqaba. Spatial and temporal distribution of temperature, salinity and density showed significant
differences between months in the coastal and offshore region and no significant differences among the coastal sites, between
the surface and bottom waters and between coastal and offshore waters. Therefore, the temporal and spatial variation of water
properties in the northernmost Gulf of Aqaba behave similarly compared to other parts. The coastal current below 12 m depth
was weak (3-6 cms-1) and fluctuated from east-northeastward to west-southwestward (parallel to the shoreline), which may be related to the effect
of bottom topography and/or current density due to differential cooling between eastern and western parts in the study area,
and windinduced upwelling and downwelling in the eastern and western side, respectively. The prevailing northerly winds and
stratification conditions during summer were the main causes of the southward current at 6 and 12 m depths with average speed
of 28 and 12 cms-1, respectively. 相似文献
5.
Mazen?AbualtayefEmail author Hassan?Al-Najjar Yunes?Mogheir Ahmed?Khaled?Seif 《Arabian Journal of Geosciences》2016,9(10):572
Gaza central seawater desalination plant is a promising solution to alleviate the problem of water crisis in the Gaza Strip. The plant in the short term, phase (I), will desalinate seawater for potable uses with a capacity of 55 million cubic meters per year, while in the long term, phase (II), the plant capacity will be doubled to 110 million cubic meters per year of freshwater. As a product from the reverse osmosis process, a huge amount of brine with salinity reaches to 75,000 mg/L will be redirected to seawater; nearly 12,200 m3/h of brine will be rejected from phase (I) while in the long term, a brine flow rate of 24,400 m3/h will be disposed from phase (II). In order to minimize the negative impacts of the rejected brine on the marine environment, it is urgent to modeling numerically the impact of the discharged brine through various disposal systems to define the most environmental system. Various scenarios were defined and simulated using CORMIX model to study the efficiencies of onshore surface open channel, offshore submerged single port as well as offshore submerged multiport outfalls taking salinity variations as an indicator. Sensitivity analysis was conducted to identify the most influencing input parameters on the simulation results as well as to evaluate the optimal environmental disposal system which can mitigate the adverse impacts of brine on the marine ecosystem as much as possible in the worst seawater conditions. The simulation results showed that the discharge via surface open channel is not environmentally feasible where the seawater salinity rose by more than 2000 mg/L at RMZ. The single-port scenario can meet the regulations at RMZ but the standard at GMZ was not met, where the rejected brine from phase (I) through single port at 1500 m offshore raises the seawater salinity at GMZ by more than 600 mg/L. The staged multiport outfall, capped by 24 ports, achieves acceptable brine dilution at seawater depth of about 7.5 m, and in the worst ambient conditions in the case of phase (II) in operation, the brine’s excess salinity was 536, 497, and 379 mg/L above the salinity of seawater at RMZ, GMZ, and ROI, respectively. 相似文献
6.
Al-Najjar Tariq Wahsha Mohammad Al-Khushman Mwaffaq Khalaf Maroof Hardage Kyle Hayek Wissam Khadra Khalid Abu Paytan Adina 《Ocean Science Journal》2021,56(4):364-377
Ocean Science Journal - To assess the utility of the seagrass (Halophila stipulacea) for biomonitoring of metal pollution, seagrass samples were collected from four sites along the Jordanian coast... 相似文献
1