نتایج جستجو برای: gravel soils

تعداد نتایج: 52100  

2017
Artur Pliszko Małgorzata Jaźwa

The paper provides data on the fl oristic composition of vegetation in anthropogenic habitats suitable for Erigeron × huelsenii, a spontaneous hybrid between the alien E. canadensis and native E. acris s. str. The study is based on 21 phytosociological relevés (vegetation plots) of 5×5 m size made in 2013–2014 in the Polish part of the Lithuanian Lakeland (north-eastern Poland) using the Braun-...

2006
Jesus Carrera Lluis Solé

Passive treatment of acid mine drainage (AMD) have been applied successfully at many sites where metal concentrations are relatively low, but experience is scarce for waters with higher metal loads. In this study, we tested the suitability of caustic magnesia (MgO) as an alkaline reagent at field scale, with and without a prior calcite dissolution step. Three pilot systems where tested at the “...

2017
A. A. Embaby A. Abu Halawa M. Ramadan

In Kingdom of Saudi Arabia, there are several areas where expansive soil exists in the form of variable-thicknesses layers in the developed regions. Severe distress to infrastructures can be caused by the development of heave and swelling pressure in this kind of expansive shale. Among the various techniques for expansive soil mitigation, the removal and replacement technique is very popular fo...

Journal: :Journal of contaminant hydrology 2003
W J Hunter

Permeable in situ denitrifying barriers can remove nitrate from groundwater. Barriers may be constructed by filling an excavated area with a porous mixture of sand, fine gravel, and substrate or by the injection of a nonaqueous phase substrate into an aquifer. The substrate stimulates the development of a denitrifying microbial community by providing an electron donor. The objective of this stu...

ژورنال: آبخیزداری ایران 2020

       In this study, the possibility of using a combination of gravel filters with plastic cover to increase water infiltration and soil moisture storage in rainwater catchment systems was investigated. For this purpose, five treatments (with three replications) including control treatment, vegetation removal with filter, vegetation removal without filter, semi-insulated system with filter, an...

Journal: :Ecological applications : a publication of the Ecological Society of America 2010
Janet C Jorgenson Jay M Ver Hoef M T Jorgenson

In response to the increasing global demand for energy, oil exploration and development are expanding into frontier areas of the Arctic, where slow-growing tundra vegetation and the underlying permafrost soils are very sensitive to disturbance. The creation of vehicle trails on the tundra from seismic exploration for oil has accelerated in the past decade, and the cumulative impact represents a...

ژورنال: علوم آب و خاک 2002
جلالیان, احمد , رمضانپور, حسن ,

Soil development and variability of soil properties on different landforms of Central Zagros were investigated. The study area covers two climatic regions including Shahrekord and Chellgerd with mean annual precipitations of 314 and 1224 mm, respectively. In Shahrekord area, the amount of Feo (amorphous and organic-bound iron) was higher in surface horizons, whereas, the Fed (crystalline, amorp...

Journal: :International Journal of Geophysics 2022

Site characterization is a prerequisite for the successful and economic design of engineering structures earthworks by providing geological information any proposed project. Until now, no detail study has been carried out on site classification using shear wave velocity (Vs) up to top 30 m depth in Hawassa town. For this study, multichannel analysis surface waves (MASW) was used determine varia...

2016
Tian Y. Dong Jeffrey A. Nittrouer Elena Il’icheva Maksim Pavlov Brandon McElroy Matthew J. Czapiga Hongbo Ma Gary Parker

The Selenga River Delta, Lake Baikal, Russia, is ~600 km2 in size and contains multiple distributary channels that receive varying amounts of water and sediment discharge. The delta is positioned along the deep-water (~1600 m) margin of Lake Baikal, a half-graben–styled rift basin, qualifying it as a modern analogue of a shelf-edge delta system. This study provides a detailed field survey of ch...

2009
Megat M. Noor

The last few decades witnessed sharp focus on environment pollution and its impact on life in nature. Wetlands can be used for biological treatment of wastewater. Problem statement: Scarcity of water is considered as a global problem and Iran is one the countries which is facing water shortage problem. Pollution of water bodies restrict the availability of water for various uses. Treatment of w...

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