Understanding the impact of droughts in the Yarmouk Basin,Jordan: monitoring droughts through meteorological and hydrological drought indices     

Alsharifa Hind Mohammad  Hahn Chul Jung  Taleb Odeh  Chandrashekhar Bhuiyan  Hussam Hussein 《Arabian Journal of Geosciences》2018,11(5):103

This article assesses drought status in the Yarmouk Basin (YB), in northern Jordan, using the Standardized Precipitation Index (SPI), the Standardized Water-Level Index (SWI), and the Percent Departure from Normal rainfall (PDNimd) during the years 1993–2014. The results showed that the YB suffers from frequent and irregular periods of drought as variations in drought intensity and frequency have been observed. The SPI results revealed that the highest drought magnitude of ??2.34 appeared at Nuaimeh rainfall station in 1991. This station has also experienced severe drought particularly in years 1995, 1999, 2005, and 2012 with SPI values ranging from ??1.51 to ??1.59. Some other rainfall stations such as Baqura, Ibbin, Khanasiri, Kharja, Mafraq police, Ramtha, Turra, and Umm Qais have also suffered several periods of drought mostly in 1993. The SWI results show the highest extreme drought events in 2001 in Souf well while other extreme drought periods were observed at Wadi Elyabis well in 1994 and at Mafraq well in 1995. As compared to SPI maps, our SWI maps reflect severe and extreme drought events in most years, negatively impacting the groundwater levels in the study area.  相似文献   

Initial assessment of recharge areas for large karst springs: a case study from the central Zagros Mountains,Iran     

Hossein?Karimi VardanjaniEmail author  Manouchehr?Chitsazan  Derek?Ford  Haji?Karimi  Abbas?Charchi 《Hydrogeology Journal》2018,26(1):57-70

Sousan Spring emerges from the Keyno Anticline, Zagros Mountains (Iran), and the mean annual discharge is ~24 m³/s. Geological and hydrochemical evaluations suggest that the spring recharge is from the limestone Ilam-Sarvak Formation (Cretaceous) but the Mafaroon Fault, a major thrust feature, influences the regional groundwater flow path by juxtaposing other strata. Geological, geochemical, stable isotope and water balance studies were employed to interpret this behavior. Using the isotope data, the sources and elevations of the recharge area were found. Temporal variations of the isotopic data were compared with variations of electrical conductivity (EC). Unexpectedly, high EC was associated with a relative increase of discharge and depletion of δ¹⁸O. Several hypotheses were investigated and approximate water balance studies employed for validation. It was found that an elongated catchment on the Keyno Anticline plus a lesser catchment on a pair of parallel anticlines recharge the aquifer. While the long groundwater flow path along the Keyno Anticline plus guidance by Mafaroon Fault and the adjacent Garou shaly strata lead to increased EC in the Sousan Spring at the end of the dry season, a flow pulse from two adjoining anticlines (Mahalbakh and Shirgoon) arrives at the same time to increase the discharge and deplete the δ¹⁸O signal. Apparently the spring did not experience true base flow conditions during the recorded hydrological year. Although the spring response to specific precipitation events was similar to typical karst aquifers, standard interpretation of recession curves and related coefficients will not be practical at Sousan.  相似文献   

Petrography,geochemistry, and U–Pb geochronology of pegmatites and aplites associated with the Alvand intrusive complex in the Hamedan region,Sanandaj–Sirjan zone,Zagros orogen (Iran)     

Sepahi  Ali Asghar  Salami  Sedigheh  Lentz  David  McFarlane  Christopher  Maanijou  Mohammad 《International Journal of Earth Sciences》2018,107(3):1059-1096

International Journal of Earth Sciences - The Alvand intrusive complex in the Hamedan area in Iran is in the Sanandaj–Sirjan zone of the Zagros orogen. It consists of a wide range of plutonic...  相似文献   

The Response of Macrobenthic Communities to Environmental Variability in Tropical Coastal Waters     

Seyedeh Belin Tavakoly Sany  Mohammad Tajfard  Rosli Hashim  Majid Rezayi  Mohammad Azizur Rahman  David J. Karlen 《Estuaries and Coasts》2018,41(4):1178-1192

The relative contributions of spatial and temporal fluctuations are different in shaping natural communities in a tropical coastal/estuarine system. Understanding how coastal communities respond to these fluctuations is still equivocal, and thus, available data are rare. Here, multiple analytical approaches were used to identify key spatial and temporal factors, and to quantify their relative roles in shaping a macrobenthic community through space (contamination degree, physical parameters, and sediment characteristics) and time (climatic factors, season, and year). A dataset of eight sampling times was analyzed over a period of 2 years, in which macrobenthic species abundances were sampled. A total of 33 species were identified, including 18 bivalves, 5 gastropods, and 4 crustaceans. The other taxa were less diverse. The results show that there were no significant temporal changes of macrobenthic community structure, but spatial changes were significant and synchronized with environmental factors (i.e., sediment characteristics, water depth, and the distance from anthropogenic sources). This study demonstrates that spatial factors played a primary role in structuring of macrobenthic assemblages, whereas the influence of temporal factors appeared less across geographically distinct sites. Thus, temporal variation of a coastal macrobenthic community appears to be controlled by partly different processes at different scales.  相似文献   

Automatic extraction of sophisticated qualitative trajectory relationships between two moving objects in space‐time     

Mohammad H. Vahidnia 《Transactions in GIS》2021,25(1):334-358

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Estimating Menard pressuremeter modulus and limit pressure from SPT in silty sand and silty clay soils. A case study in Mashhad,Iran   总被引：1，自引：0，他引：1  

Akbar Cheshomi  Mohammad Ghodrati 《Geomechanics and Geoengineering》2015,10(3):194-202

The Menard pressuremeter test is a relatively expensive in situ test, which generates useful information about the strength and deformation properties of any soil and weak rock, which is carried out in some projects. On the other hand, the SPT test is a rather inexpensive, simple and typical in situ test used to determine the engineering properties of silt, clay, sand, and fine gravel which is utilised in almost all projects.

In this study SPT blow counts (N₆₀) were correlated with pressuremeter modulus (E_PMT) and limit pressure (P_L) and empirical equations were proposed to estimate P_L and E_PMT from N₆₀ in silty sand and silty clay soils separately. These tests have been conducted during subway geotechnical investigation in Mashhad, Iran.

Moreover, in order to verify these empirical equations, they were compared with similar equations that have been proposed by other researchers. These comparisons display that in all equations a linear relationship exists between N₆₀ - E_PMT and N₆₀ - P_L. However, the line slopes are different so it can be concluded the line slopes are related to soil type and geological condition of an area. Thus, for each area a separate empirical equation must be presented.  相似文献   

Characterizing spatial variability of soil properties in salt affected coastal India using geostatistics and kriging   总被引：2，自引：0，他引：2  

Rahul Tripathi  A. K. Nayak  Mohammad Shahid  R. Raja  B. B. Panda  S. Mohanty  Anjani Kumar  B. Lal  Priyanka Gautam  R. N. Sahoo 《Arabian Journal of Geosciences》2015,8(12):10693-10703

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A multi-agent architecture for geosimulation of moving agents     

Mohammad H. Vahidnia  Ali A. Alesheikh  Seyed Kazem Alavipanah 《Journal of Geographical Systems》2015,17(4):353-390

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A class of relativistic anisotropic charged stellar models in isotropic coordinates     

Neeraj Pant  N. Pradhan  Mohammad Hassan Murad 《Astrophysics and Space Science》2015,355(1):137-145

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Spatio-temporal long-term (1950–2009) temperature trend analysis in North Carolina,United States     

Mohammad Sayemuzzaman  Manoj K. Jha  Ademe Mekonnen 《Theoretical and Applied Climatology》2015,120(1-2):159-171

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