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排序方式: 共有83条查询结果,搜索用时 703 毫秒
61.
Hamza Jerbi Sylvain Massuel Christian Leduc Jamila Tarhouni 《Arabian Journal of Geosciences》2018,11(10):236
The aquifer of the semi-arid Kairouan plain has been exploited for decades to supply the growing irrigated agriculture and the need of drinking water. In parallel, the major hydraulic works drastically changed the natural groundwater recharge processes. The continuous groundwater level drop observed since the 1970s naturally raises the question of groundwater storage sustainability. To date, hydrogeological studies focused on groundwater fluxes, but the total amount of groundwater stored in the aquifer system has never been fully estimated. This is the purpose of the present paper. A complete database of all available geological, hydrogeological and geophysical data was created to build a 3D lithology model. Then, the lithological units were combined with the hydraulic properties to estimate the groundwater storage. Over the 700 km2 of the modelled area, the estimated storage in 2013 was around 18?×?109 m3 (equivalent to 80 times the annual consumption of 2010) with a highly variable spatial distribution. In 45 years (1968–2013), 12% of the amount of groundwater stored in the aquifer has been depleted. According to these results, individual farms will face strong regional disparities for their access to groundwater in the near future. 相似文献
62.
Xue Peipei Wen Zhang Park Eungyu Jakada Hamza Zhao Dejun Liang Xing 《Hydrogeology Journal》2022,30(4):1135-1155
Hydrogeology Journal - This study evaluated the spatial variability of hydraulic conductivity (K) along the Han River watershed in the Jianghan Plain (China) by using different geostatistical... 相似文献
63.
Lotfi Mabrouk Taher Guarred Asma Hamza Imed Messaoudi Ahmed Noureddine Hellal 《Marine pollution bulletin》2014
Fluctuating asymmetry, a random deviation of bilateral traits, is assessed on grass goby Zosterisessor ophiocephalus Pallas, 1811 living in one disturbed site and in one unpolluted site Gulf of Gabes (Tunisia). Statistical analysis showed that assessed asymmetries are fluctuating. FA of orbital diameter, sub-orbital distance, pectoral fin and post-orbital length are higher in polluted site compared to control. Chemical pollution seems to be responsible for this high FA. 相似文献
64.
Received: 23 March 1999 / Accepted: 25 August 1999 相似文献
65.
This paper is likely one of the very recent researches based on an experimental study, which aims to investigate some geotechnical performances of fine-grained soil treated with industrial wastewater sludge. The experimental program conducts the standard compaction, direct shear, California bearing ratio (CBR), and unconfined compressive strength (UCS) tests. The sludge proportions in samples of the soil + sludge mixtures are 0, 5, 10, 20, 30, 40, 50, 60, 70, and 80 % by dry weight of the mixture. The results indicate that the internal friction angle of untreated soil is significantly enhanced at most of the sludge dosages (p < 0.05). The CBR values offer that the soil quality can be improved to “good” rating quality to use “base” layers in stabilizations up to the 50 % sludge dosage. The contribution is also obtained by the UCS values that increase with the sludge addition. Moreover, the stress–strain responses promise to develop the ductility behavior due to the sludge inclusion. Consequently, the soil mixtures treated with the sludge have exhibited satisfactory geotechnical characteristics. Thus, this study suggests that the industrial wastewater sludge can be potentially employed for improvement of fine-grained soil in the stabilizations. The proposed soil stabilization with locally available industrial wastewater sludge can also provide recycling and sustainability to the environment. 相似文献
66.
Seismic hazard studies were conducted for Gaziantep city in the South Anatolia of Turkey. For this purpose, a new attenuation
relationship was developed using the data of Zaré and Bard and accelerations were predicted employing this new equation. Deterministic
approach, total probability theorem and GIS methodology were all together utilized for the seismic assessments. Seismic hazard
maps with 0.25° grid intervals considering the site conditions were produced by the GIS technique. The results indicated that
the acceleration values by the GIS hazard modelings were matched with the ones from the deterministic approach, however, they
were underestimated comparing with the total probability theorem. In addition, the GIS based seismic hazard maps showed that
the current seismic map of Turkey fairly yields conservative acceleration values for the Gaziantep region. Therefore, the
constructed GIS hazard models are offered as a base map for a further modification of the current seismic hazard map. 相似文献
67.
RW Jabado SM Al Ghais W Hamza DP Robinson AC Henderson 《African Journal of Marine Science》2016,38(2):217-232
Landing site and market surveys of sharks landed along the Arabian Gulf coast of the United Arab Emirates were undertaken between October 2010 and September 2012 to obtain biological data from this artisanal fishery. Data were collected on the size and sex of 12 482 individuals representing 30 species. Maximum sizes of Carcharhinus sorrah, C. amblyrhynchoides and Hemipristis elongata were extended by at least 300?mm total length (TL) compared with published global maxima. The size at 50% maturity was determined for males of five species and this indicated that the males of smaller shark species (<1 000 mm maximum TL) in the fishery were largely mature. For many species, including Loxodon macrorhinus and Mustelus mosis, overall sex ratios were male-biased, indicating that sexual segregation is likely in those species. Furthermore, sex ratios for several species, such as Rhizoprionodon acutus, showed differences across seasons. Overall, the landings contained a high proportion of juveniles, causing concerns about the sustainability of this fishery. Biological parameters of a number of species differed from those recorded earlier for the region, demonstrating a need for additional local data collection to support the development of management measures. 相似文献
68.
Hamza Valiya M. Vieira Fabio P. Silva Raquel T. A. 《International Journal of Earth Sciences》2018,107(1):19-33
International Journal of Earth Sciences - A comprehensive analysis of thermal gradient and heat flow data was carried out for sedimentary basins situated in the continental margin of Brazil (CMB).... 相似文献
69.
Rim Ladhar‐Chaabouni Amel Hamza‐Chaffai Yann Hardivillier Benoît Chénais Françoise Denis 《Marine Ecology》2010,31(2):355-363
The internal transcribed spacer 1 (ITS1) region of 29 individuals of Cerastoderma glaucum (from the Mediterranean Sea, the Atlantic and the North Sea) and 18 individuals of Cerastoderma edule (from the Atlantic and the North Sea) and the cytochrome c oxidase subunit I (COI) region of 43 individuals of C. glaucum (from the Mediterranean Sea, the Atlantic and the North Sea) and 9 individuals of C. edule (from the Atlantic and the North Sea) were PCR amplified and sequenced. The ITS1 sequences led us to describe 27 genetic haplotypes, while 21 genetic haplotypes were determined via the COI sequences. The ITS1 and the COI sequences revealed an important genetic variability within the Mediterranean population of C. glaucum, which contained two different phenotypes: orange foot and yellow foot. A genetic differentiation between the two phenotypes was revealed by the nucleotide diversity index (π) and is strengthened by the AMOVA analysis. This result leads us to suspect the presence of two different groups in the same population of C. glaucum. Nevertheless to be confirmed this hypothesis requires further studies using more locations and a larger number of sample sizes. 相似文献
70.