Soil absorption systems (SAS) are used commonly to treat and disperse septic tank effluent (STE). SAS can hydraulically fail as a result of the low permeable biomat zone that develops on the infiltrative surface. The objectives of this experiment were to compare the hydraulic properties of biomats grown in soils of different textures, to investigate the long-term acceptance rates (LTAR) from pr...

We examined the storage dynamics and isotopic composition of soil water over 12 months in three hydropedological units in order to understand runoff generation in a montane catchment. The units form classic catena sequences from freely draining podzols on steep upper hillslopes through peaty gleys in shallower lower slopes to deeper peats in the riparian zone. The peaty gleys and peats remained...

Groundwater flow and nutrient transport were studied in a riparian meadow during a three-year period. The meadow is situated along a first order stream in the River Gjern catchment area, Jutland, Denmark. Field data included measurements of hydraulic head, hydraulic conductivity and soil characteristics. Groundwater sampled from piezometers was analysed for nitrate, ammonium and phosphate. Nitr...

[1] We develop a theory that relates gas hydrate saturation in marine sediments to the depth of the sulfate‐ methane transition (SMT) zone below the seafloor using steady state, analytical expressions. These expressions are valid for systems in which all methane transported into the gas hydrate stability zone (GHSZ) comes from deeper external sources (i.e., advective systems). This advective co...

A new high-performance numerical model (Frehg) is developed to simulate water flow in shallow coastal wetlands. Frehg solves the 2D depth-integrated, hydrostatic, Navier–Stokes equations (i.e., shallow-water equations) surface domain and 3D variably-saturated Richards equation subsurface domain. The two domains are asynchronously coupled surface-subsurface exchange. applied evaluate sensitivity...

The water table, as used routinely by hydrologists in various disciplines, is seemingly a simple concept: it marks the top of saturated zone porous media. But closer inspection reveals that much theory and practice concerning table are less straightforward than often assumed. We review departures from classical definition consider following phenomena: perched inverted tables, gas bubbles within...

We review the status of research concerning the links between hydrologic towpaths and the biogeochemicai environment controlling Nitrogen cycling and transport in near-stream saturated zones, centering on stream environments of the northern, teml~rate-forested zone. N retention, transformation and mobilization occur in streamside wetlands, floodplains, riparian zones, seepage faces, and the hyp...

By Dr. Mercola In all likelihood your doctor and nearly every public health authority has told you to stay away from saturated fats, warning you it will raise your LDL cholesterol and clog your arteries, putting you at increased risk for heart disease. The 2015 USDA dietary guidelines also still advise limiting saturated fats to a maximum of 10 percent of your daily calories, warning of similar...