water and soil pollution by human pathogenic bacteria draw attention of many researchers. duration of bacterial survival for reach to the soil and water resources is very important. current study focused on the effects of caco3 and caso4 compounds on escherichia coli survival. using caco3, caso4 compounds and fine sand particles (

hydraulic attributes play important role in hydrological studies, soil conservation, designing irrigation and drainage systems, soil conservation, and controlling soil erosion in watersheds. their measurements are very tedious and time consuming and due to high spatial variability, a large number of measurements are required for obtaining reliable values. nowadays, prediction of these attribute...

Fluidized-bed biological reactors (FBBRs) may be used to remove chloroethenes such as trichloroethene (TCE) from groundwater. Proper selection of FBBR aqueous growth medium, biofilm solid support media type and size, and bed charge (bed depth to column length fraction) are critical for establishing a biomass of sufficient quantity and activity to transform TCE via aerobic cometabolism, which re...

Seabed trenches reduce anchor capacity. However, the adverse influence is not considered in current design, and no guideline found engineering practice. This paper presents a framework for mooring design sand considering seabed based on floater hydrodynamics. First, hydrodynamic calculation of studied coupled with system was conducted. Then, potential trench profile assessed using line–seabed d...

Abstract Sand aprons are distinctive landforms that offer important insights into sedimentary dynamics for reef platform development. Here we link temporal and spatial scales of 21 sand in the southern Great Barrier Reef to understand their Holocene formation evolution response relative sea-level changes, depth Pleistocene base, contemporary morphodynamics. Our results show lagoon infilling is ...

We evaluated the utility of whole-rock amino acid racemization as a method for the stratigraphic correlation and dating of carbonate sediments in the Hawaiian Islands. D-alloisoleucine/L-isoleucine (A/I) ratios were determined for carbonate sand and sandstone samples from 25 localities in the archipelago. The superposition of A/I ratios within stratigraphic sections and the regional concordance...

Knowledge of coral reef GPP is the foundation for understanding the function of reef systems. GPP sets the maximum energy available to a reef community through autotrophic pathways and ultimately limit the biomass and secondary production of reef consumers [1-3]. Calcification, or the production of carbonate, is directly related to the value of GPP [4]. GPP describes the basic energy production...

PURPOSE This study was designed to assess the mechanical properties of two calcium carbonate tempers, limestone and burnt shell. These tempers have been previously compared, in separate studies, to silicate-based grit or sand temper and, relative to the latter, are assumed to possess similar mechanical properties. However, their simultaneous use at the Morrison Village site begs the question: d...