Correlation analyses between downward longwave radiation particulate matters,aerosol optical depth,and metrological variables under non-dusty and cloudless conditions     

Maghrabi  Abdullrahman  Alharbi  Badr  Alharbi  Hamoud  Aldosari  Abdulah 《Theoretical and Applied Climatology》2022,148(3-4):1577-1586

Theoretical and Applied Climatology - This study used downward longwave (LW) radiation measurements, air temperature (T), particulate matter (PM) concentrations of fine (PM 2.5) and coarse (PM10)...  相似文献   

Temporal and Spatial Sampling Constraints in High-Resolution 3-D Seismic Surveys     

Abdulah  K. C.  Anderson  J. B.  Coperude  S.  Canning  A. 《Marine Geophysical Researches》1997,19(2):97-113

An experimental, high-resolution 3-D seismic survey was acquired over a 1.5 km2 section of an incised fluvial valley. The data were acquired as a near-zero offset, single-channel survey using a 15 in3 water gun as the source, and differential GPS for navigation and positioning. The objective was to acquire a 3-D seismic data volume suitable for calculating the volume of shallow sand deposits. Horizontal time sections from the 3-D volume clearly show the flanks of the incised valley, as well as high-amplitude reflections interpreted as coarse-grained channel-lag deposits. The volume of this lag deposit can be calculated using the combination of the horizontal and vertical sections from the high-resolution 3-D seismic data set. The results of the experiment also illustrate the importance of spatial sampling in 3-D seismic surveying.  相似文献   

Field technique of permeability tests in highly fissured limestone strata     

Adnan Al-Salihi  Abdulah Asaad 《Hydrogeology Journal》2002,10(5):566-575

A design of a dewatering system is necessary for site improvement prior to the construction of some structures. The design of an efficient dewatering system requires estimating the value of the in-situ coefficient of permeability. The available relationships for estimating the permeability coefficient were developed based on limited field measurements and conditions, and their predictions vary by several orders of magnitudes. Therefore, it was necessary to conduct field measurements of permeability and determine the relationship that best fits these measurements prior to the design of a dewatering system for specific geological and site conditions. This paper presents field measurements of permeability in complex chaotic and diagenetic limestone strata. It also offers comparative analysis of several relationships available in the literature for predicting the in-situ coefficient of permeability. The analysis is conducted for both steady and nonsteady conditions. The results show that the coefficient of permeability value is dependent on the water table level, which is affected by the tidal condition. The US Navy equation is shown to give the best correlation with field measurements. Electronic Publication  相似文献