Concentration of selected radionuclides in seawater from Kuwait     

Uddin S  Al Ghadban AN  Aba A  Behbehani M 《Marine pollution bulletin》2012,64(6):1261-1264

No baseline existed for the radionuclides in Kuwait territorial water. With changing trend in the region to embrace nuclear energy, the baseline study is imperative to create a reference and to record the influence-functioning of upcoming power plants. The first one in Bushehr, Iran is ready to start and several more are likely to come-up in UAE, Saudi Arabia and Kuwait. The present baseline concentration of the four considered radionuclide's show low concentration of tritium, polonium, strontium and cesium; their concentration is comparable to most oceanic waters.  相似文献   

Improving Scatterometry Retrievals of Wind in Hurricanes Using Non-Simultaneous Passive Microwave Estimates of Precipitation and a Split-Step Advection/Convection Model     

Alex Fore  Ziad S. Haddad  T. N. Krishnamurti  Ernesto Rodgridez 《Pure and Applied Geophysics》2012,169(3):415-424

One of the current problems in the accurate estimation of over-ocean wind from scatterometry observations is the proper accounting for precipitation. Specific cases such as hurricanes are particularly difficult, because precipitation in the eye wall and rain bands can be quite heavy, and therefore, affect the scatterometer signatures so drastically that a category-4 hurricane can appear, to the scatterometer, to have category-1 winds. We have developed an approach to infer and account for the signature of the precipitation from non-simultaneous passive-microwave measurements of rain, with the help of geostationary IR measurements. In this note, we describe the basic approach, and the results of applying it to the data taken by the Tropical Rainfall Measurement Mission Microwave Imager measurements several hours before and after the QuikSCAT observation of Hurricane Rita in September 2005. We also describe how we are enhancing the approach with more realism in the assimilation of the IR information.  相似文献   

Characteristics of concentrated flow hydraulics for rangeland ecosystems: implications for hydrologic modeling   总被引：1，自引：0，他引：1  

Osama Z. Al‐Hamdan  F.B. Pierson Jr  M.A. Nearing  J.J. Stone  C.J. Williams  C.A. Moffet  P.R. Kormos  J. Boll  M.A. Weltz 《地球表面变化过程与地形》2012,37(2):157-168

Concentrated flow is often the dominant source of water erosion following disturbance on rangelands. Because of the lack of studies that explain the hydraulics of concentrated flow on rangelands, cropland‐based equations have typically been used for rangeland hydrology and erosion modeling, leading to less accurate predictions due to different soil and vegetation cover characteristics. This study investigates the hydraulics of concentrated flow using unconfined field experimental data over diverse rangeland landscapes within the Great Basin Region, United States. The results imply that the overall hydraulics of concentrated flow on rangelands differ significantly from those of cropland rills. Concentrated flow hydraulics on rangelands are largely controlled by the amount of cover or bare soil and hillslope angle. New predictive equations for concentrated flow velocity (R² = 0·47), hydraulic friction (R² = 0·52), and width (R² = 0·4) representing a diverse set of rangeland environments were developed. The resulting equations are applicable across a wide span of ecological sites, soils, slopes, and vegetation and ground cover conditions and can be used by physically‐based rangeland hydrology and erosion models to estimate rangeland concentrated flow hydraulic parameters. Published in 2011. This article is a US Government work and is in the public domain in the USA.  相似文献   

Attapulgite as Potential Adsorbent for Dissolved Organic Carbon From Oily Water          下载免费PDF全文

Mansour Al. Haddabi  Hari Vuthaluru  Hussein Znad  Mushtaque Ahmed 《洁净——土壤、空气、水》2015,43(11):1522-1530

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Geospatial and geostatistical approach for groundwater potential zone delineation   总被引：1，自引：0，他引：1       下载免费PDF全文

Javed Mallick  Chander Kumar Singh  Hussein Al‐Wadi  Mohd Ahmed  Atiqur Rahman  Satyanarayan Shashtri  Saumitra Mukherjee 《水文研究》2015,29(3):395-418

Over the past few decades, groundwater has become an essential commodity owing to increased demand as a result of growing population, industrialization, urbanization and so on. The water supply situation is expected to become more severe in the future because of continued unsustainable water use and projected change in hydrometeorological parameters due to climate change. This study is based on the integrated approach of remote sensing, geographical information system and multicriteria decision‐making techniques to determine the most important contributing factors that affect the groundwater resources and to delineate the groundwater potential zones. Ten thematic layers, namely, geomorphology, geology, soil, topographic elevation (digital elevation model), land use/land cover, drainage density, lineament density, proximity of surface water bodies, surface temperature and post‐monsoon groundwater depth, were considered for the present study. These thematic layers were selected for groundwater prospecting based on the literature; discussion with the experts of the Central Ground Water Board, Government of India; field observations; geophysical investigation; and multivariate techniques. The thematic layers and their features were assigned suitable weights on Saaty's scale according to their relative significance for groundwater occurrence. The assigned weights of the layers and their features were normalized by using the analytic hierarchy process and eigenvector method. Finally, the selected thematic maps were integrated using a weighted linear combination method to create the final groundwater potential zone map. The final output map shows different zones of groundwater potential, namely, very good (16%), good (35%), moderate (28%) low (17%) and very low (2.1%). The groundwater potential zone map was finally validated using the discharge and groundwater depth data from 28 and 98 pumping wells, respectively, which showed good correlation. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

The Taratash indenter and its role in the geological structure of the Urals     

Al. V. Tevelev  Ark. V. Tevelev  V. A. Fedorchuk  A. O. Khotylev  I. A. Kosheleva 《Moscow University Geology Bulletin》2017,72(2):95-105

This work presents the results of studying zones bounded by the Archean and Early Proterozoic Taratash block, which breaks the meridional structure of the Urals, pinching its structural zones at the latitude of the town of Miass. The mesostructures of rupture zones, microtextures of tectonites, anisotropy of the magnetic susceptibility, and seismic-wave propagation rate in blastomylonites were studied. The kinematic history of the Taratash block consists of two phases: (1) exhumation in the Middle Riphean under conditions of crustal extension; and (2) the formation of an indenter in the Late Paleozoic under conditions of compression.  相似文献   

Prediction of input energy spectrum: attenuation models and velocity spectrum scaling          下载免费PDF全文

F. S. Alıcı  Halûk Sucuoğlu 《地震工程与结构动力学》2016,45(13):2137-2161

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Mobility of rare earth elements in the system soils–plants–groundwaters: a case study of an arid area (Oman)     

Khadija Semhi  Osman A. E. Abdalla  Salah Al Khirbash  Tabisam Khan  Salim Asaidi  Sardar Farooq 《Arabian Journal of Geosciences》2009,2(2):143-150

Groundwater samples from six wells and various species of plants from soils developed on ophiolites were collected from an arid area (AlKhod area, Oman) and analyzed for trace elements including rare earth elements (REEs). The distribution patterns of REEs in plants indicated an enrichment in middle REEs (MREEs?=?Sm to Dy) and heavy REEs (HREEs?=?Ho to Lu), when they are normalized to the REE composition of the Post Archean Australian Shale (PAAS), with a significant negative anomaly in Ce and a positive anomaly in Eu. Compared to Oman ophiolites, the REEs in different species of plants are depleted in Ce and enriched in MREEs and slightly enriched in light REE (LREE?=?from La to Nd). Relative to PAAS, the distribution of REEs in groundwaters revealed similar patterns to the REE distribution in plants. The distribution patterns of REEs in plants relative to those in waters are nearly flat. These patterns suggest that the transfer of REEs from soil solutions to the groundwaters in Oman occurs without any significant fractionation.  相似文献   

The dynamics of two interacting compositional plumes     

T. B. A. Elbashir  M. A. Al Lawati  I. A. Eltayeb 《地球物理与天体物理流体动力学》2013,107(1):29-63

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Field Evaluation of Arid Soils Wetting Pattern in Subsurface Drip Irrigation Scheme     

Naji K. Al‐Mefleh  Majed Abu‐Zreig 《洁净——土壤、空气、水》2013,41(7):651-656

A field study evaluating wetted radius (Wr), downward depth (Dd), and upward movement (Um) under different emitter discharges and lateral depths was conducted. Four emitter discharges (2, 4, 8, and 16 L/h) and four lateral depths (0, 10, 20, and 30 cm) were tested in a clay loam soil. Relationships were found between the emitter discharge and lateral depth versus Wr, Dd, and Um. Wetting area at the surface occurs under different emitter discharges and lateral depths except at 30 cm lateral depth. At lateral depth of 0 and 10 cm, Wr and emitter discharge were positively correlated. The Dd was not affected by emitter discharge except for laterals installed at 20 cm depth. At 30 cm lateral depth, the correlations between each of Wr, Um, and Dd with emitter discharge were poor. The ratios of Wr/Dd and Um/Dd, with respect to emitter position, were less than unity over different emitter discharges and lateral depths. These results shed some light on the design of subsurface drip irrigation scheme so that the spacing between emitters should be determined based on the lateral depths and discharge of emitters. Evaporation losses were negligible for the 30‐cm‐lateral depth since the upward moisture movement has not reached the soil surface area at all discharge rates tested in the study.  相似文献