Pulses of fine sediment in gravel-bedded rivers can cause extensive fine sediment infiltration (FSI) into void spaces in coarse bed material, potentially altering river morphodynamics and aquatic ecosystems. Previous work suggests a conceptual model of FSI whereby FSI occurs to a limited depth as a function of the relative grain size of bed sediment compared with infiltrating sediment and is in...

During the last decades there is low flow in the Euphrates River then consequently low flowin Hilla River which is branch of Euphrates River, Iraq. The Tyass Barrage constructed to lift thehydraulic head upstream in Hilla River raised the groundwater table above ground surface.Environmental problems have been occurred in Hashimyia Area, Babylon Governorate, causingflooding an ar...

introduction: inequality is prevalent in all sectors, particularly in distribution of and access to resources in the health sector. the aim of current study was to investigate the distribution of physicians and hospital beds in iran in 2001, 2006 and 2011. methods: this retrospective, cross-sectional study evaluated the distribution of physicians and hospital beds in 2001, 2006 and 2011 using g...

The objective of this study was to determine the effect of human chorionic gonadotropin (hCG) on sexual maturation, plasma sex steroids (17β-estradiol, E2 and 17α-hydroxy progesterone (17α OHP)) and thyroid hormones (triiodothyronine, T3 and thyroxin, T4) levels in upstream - migrating Caspian lamprey. During the experiment, 36 fish (24 females and 12 males) in  spring 2013 and 36 fish (24 fema...

In the past 30 years efforts to protect river beds and banks have increased significantly. The selection design of proper structural solution means finding a in accordance with construction principles, geomorphology, avoiding channel aggradation, bed scour, bank erosion, resulting structure failure significant harm stream nearby property. On other hand, should be environmentally-friendly. Hydra...

A bloom of Karenia brevis Davis developed in September 2007 near Jacksonville, Florida and subsequently progressed south through east Florida coastal waters and the Atlantic Intracoastal Waterway (ICW). Maximum cell abundances exceeded 106 cells L-1 through October in the northern ICW between Jacksonville and the Indian River Lagoon. The bloom progressed further south during November, and termi...

Base-level fall in river beds occurs due to varying natural or unnatural causes. Base-level fall causes the change in the behavior of flow at the location of drop in base-level. In such situations, most of scour occur at the foot of the slope, and slope wall retreats in the upstream direction. This phenomenon widens the wall of the river bank, thus leading to its destruction. The amount of bed ...

Sand excavations in river beds have compromised the safety of several bridges recent years. Large scale sand mining from is now common Niger Delta, due to necessity reclaiming land for development purposes and meet construction needs region. There currently no regulation as where can be mined channels because lack adequate understanding risks coastal infrastructure involved with its abstraction...

Based on geologic mapping, measured sections, and lithologic correlations, the local features of the upper and lower type areas of the Early Arikareean (30.8-20.6 million years ago) Sharps Formation are revised and correlated. The Sharps Formation above the basal Rockyford Member is divided into two members of distinct lithotypes. The upper 233 feet of massive siltstones and sandy siltstones is...

this study aims to identify favorable oil–gas reservoir facies in the chishan group of the wubao fault zone (gaoyou sag, subei basin, china) using the methods of outcrops and cores observation, granularity analysis, scanning electron microscope, log data, etc. the results suggest that the chishan group in the studied area mainly develops desert sedimentary system, and contains five kinds of fac...