Hydraulic conductivity

ABSTRACT Microbial Induced Calcite Precipitates (MICP) is a new and sustainable technology used to improve the properties of construction materials. This technique works by introducing bacteria solution (e.g., Sporosarcina pasteurii, B. megaterium, Spoloactobacilus, Clostridium and Desulfotomaculum ) into the soil matrix , and then injection of a chemical solution consisting of urea and one of calcium salts (e.g., calcium chloride and calcium acetate ) into the soil matrix several times. A number

Increasing numbers of natural resources are consumed by modern society, causing growing demands of waste disposals at the same time. Statistical results showed that landfill facilities had been used as a main solid waste disposal approach in the past decades. Landfill leachate is the one of primary concerns of landfill operation. Application of reliable barriers underneath waste disposal sites to protect underground water resources has become an important research subject. However, any defect of

Radioactive Contamination Of Soil and Groundwater Due to Storage of Nuclear Waste A case of Hanford Nuclear Reservation site Name Student no Jaysheel Pandya 1001025972   Contents Introduction 3 Contaminants on and around the site 4 Soil and Groundwater Contamination 5 Sources of Contamination 5 Physical and Hydrogeological conditions of the site and waste transport pathways 6 Interaction of contaminants in groundwater 9 Uranium 9 Chromium 10 Strontium 10 Remediation Strategies

Abstract Microbial Induced Calcite Precipitates (MICP) is a new and sustainable technology used to improve the properties of construction materials. This technique works by introducing bacteria solution (e.g., Sporosarcina pasteurii, B. megaterium, Spoloactobacilus, Clostridium and Desulfotomaculum) into the soil matrix, and then injection of a chemical solution consisting of urea and one of calcium salts (e.g., calcium chloride and calcium acetate) into the soil matrix several times. A number of

(Saito, Simunek, & Mohanty, 2006) Early pioneering studies on interactions between liquid water, water vapour, and heat movement were reported by Philip and de Vries (1957), who provided a mathematical description of liquid water and water vapour fluxes in soils driven by both pressure head (isothermal) and soil temperature (thermal) gradients. They derived the governing flow equation for non-isothermal flow as an extension of the Richards equation, which originally considered only the pressure head

Turbine blades used in jet engines can be made from such materials as nickel-based superalloys. We can, in principle, even use ceramic materials such as zirconia or other alloys based on steels. In some cases, the blades may have to be coated with a thermal barrier coating (TBC) to minimize exposure of the blade material to high temperatures. What design parameters would you consider in selecting a material for the turbine blade and for the coating that would work successfully in a turbine engine

impact on seawater intrusion. Ataie-Ashtiani, Volker and Lockington(1999:17) suggested that there is a direct relationship between the area of the dispersion, the scale, the shape, the degree of the dispersion area, and parameters such as hydraulic conductivity, the comparative densities of the salt and fresh water as well as the rate of discharge of the ground water. There is limited accuracy to the usage of the models as the models are limited by assuming various situations. Altaie-Ashtiani et

In the past periods, the northwestern part of Sudan and southwestern part of Egypt (Kehl and Bornkamm, 1993) were with great effective moisture, which are evident from archaeological sites associated with remnants of playa or lake deposits. This was the source of recharge in the NSAS. The estimated recharge rates of the pluvial period were a little high at the Uweinat highlands and central Sudan area (7–15 mm/year), and low in northern Sudan and southern Egypt area (6–8 mm/year) (Fig. 13). During

Figure # 6 “Stress is the result of both trends and events in climate (Jentsch et al. 2007). The red line indicates a shifting baseline level of forest stress through time due to an increasing trend in temperature; the grey line represents stress changes due to multi-year oscillations in precipitation and temperature that are inherent in the climate system, producing stress events like extreme droughts and heat waves. Atmospheric warming increases both baseline and extreme drought stresses through

the rift the localization of groundwater is strongly controlled by the rift faults. They have contrasting role in the movement and occurrence of groundwater. Most of the faults acts as conduit for groundwater flow. In contrast to the high hydraulic conductivity of the rift fractured volcanics, some faults act as barriers of groundwater flow. This is a common case in areas of structures where the faults deep against the topographic