Compare the models of diffusion out of sediments with and without mass transfer resistances at the sediment water interface to a water column at 0 concentration. Assume the concentration of the sediment is initially uniform at 50 mg/kg for both phenanthrene and benzo[a]pyrene. (assume a soil porosity of 0.3 and foc of 0.10). Consider kwf from 0.1 cm/hr, 1 cm/hr and 10 cm/hr. Plot flux versus time from the sediments with and without the mass transfer coefficient for the various cases.

Q: A 20 m thick clay layer is sandwiched between a silty sand layer and a gravelly sand layer. The…

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Q: For a constant head laboratory permeability test on a fine sand, the following values are given:…

A: The constant head permeability test is generally a lab method that is helped to identify the…

Q: In a sample of sand, water seeps at a volume of 158 cm3 in 7.89 minutes. If the seepage area and…

A: Please refer the attached image for complete solution. THANK YOU !

Q: The laboratory tests on a soil sample gave the following results: 1). Natural water content, W₁ =…

A: Given: Natural water content, wn=25 % Liquid limit, wl=60 % Plastic limit, wp=35 % % of particle…

Q: A stratified soil has the following properties: h1 = 1.75m h2 = 2.5m h3 = 4.35m k1 = 2.25E-03 cm/sec…

A: What is the equivalent coefficient of permeability if the water flows parallel to the layer of soil…

Q: A sample of 500 g dry, when poured into a 2 litre capacity cylinder which is partially filled with…

A: Given that :- Weight of dry sand = 500 gm Water displaced by sand = 188 cm3 Volume of the sand = 188…

Q: Problem 2 Assume a clay liner with the following properties: thickness is 0.9 m, hydraulic…

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Q: A partially saturated soil specimen has a fotal mass M:1360.52 gm and a weter content w-28.35% and…

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Q: A sample of soft saturated clay weighs 330 grams and has a volume of 180 cc. After oven drying, the…

A: GIVEN DATA: Weight of saturated clay=330 gram Weight of dry soil= 210 gram Volume =180 cc

Q: A soft to very soft silty clay layer 3 m thick exists between a layer of permeable clayey silty sand…

A: Given Equation, Ss=Cα'H·log t2t1 where C'α=Ca1+ep Estimation of values, CaCc=0.04 hence…

Q: A sample of soil weighs 1.5N. Its clay fraction weighs 0.34N. If its liquid limit is 60% and its…

A: Given data Weight of soil is 1.5 N. Weight of clay fraction is 0.34 N. The liquid limit (wl) is 60…

Q: A cubic meter of dry (no water) quartz sand (G, = 2.65) with a porosity of 60% is immersed in an oil…

A: Vt = 1 m3Gs = 2.65n = 60% or 0.60 = 0.92 g/cm3 or 920 kg/m3 Vair = 0.27 m3

Q: The effective grain size of a loose uniform sand is 0.06 cm. Find the coefficient of permeability of…

A: given- Effective grain size-D10=0.06 cm

Q: Q'-4a

A: Given data -  Diameter of particles(d) = 0.10 mm  Rate of flow(Q) = 0.10 m³/s  gravity (g) = 9.81…

Q: Question 3. A DNAPLS substance was generated and released in a tire fire accident. A consulting firm…

A: The given data is shown below: Aquifer depth=1300 mSoil porosity=34%Hydraulic conductivity=41…

Q: A bed of sand consists of three horizontal layers of equal thickness. The value of Darcy's 'k' for…

A: We have to find the ratio of the permeability

Q: Q- A suspension of sand like particles in water with particles of diameter 0.10 mm and below is…

A: Given- Size of particles=0.06 mm, Efficiency of removal=100%, Discharge/flow Q=0.10 m3/s, g=9.81…

Q: Example 5.2: - Formation water sample with solids concentrations of calcium (Ca) = 460 ppm, sulfate…

A: The values and figure given in the question are as follows: The concentration of Ca=460 ppm The…

Q: How would 20 g of atrazine be distributed between a water and sediment layer in a ditch that is 50 m…

A: To solve this problem, we need to calculate the volume of water and sediment in the ditch, and then…

Q: Q1-) A soil sample in plastic limit state weighs 2.535 N and becomes 1.980 N after oven drying. The…

A:

Q: Estimate particle size of ilmenite (sg 2x sand =5.4) and anthracite (s.g. 2/3 of sand = 1.8) which…

A: Given data:Specific gravity of ilmenite = 5.4 Specific gravity of anthracite = 1.8 Specific gravity…

Q: A soil sample has solids with effective (D10) = 0.004 mm. The effective pore diameter is 30% of…

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Q: Mean diameter of the particles present of the bottom of a channel is 5cm. If the value of chezy's…

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Q: (ii) Consider a primary sedimentation tank (PST) in a water treatment plant with surface overflow…

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Q: A sample of saturated clay had a volume of 97 cm3 and a mass of 0.202 kg. When completely dried the…

A: Shrinkage limt is :SL=MC-V1-V2Wdryρw

Q: A plain sedimentation tank with a length of 20 m, width of 10 m and a depth of 3 m is used in a…

A: Given-

Q: The given values are as follows: The specimen's e=0.46 length of soil specimen=450mm constant…

A: The given data is: Void ratio of specimen (e) = 0.46 Length of soil specimen (L) = 450 mm = 0.45 m…

Q: The soil profile shown below is typical of Miami-Dade County. Estimate the equivalent permeabilities…

A: Given data : This is a problem of Soil Mechanics.

Q: In a permeability test with constant load in the laboratory, the following are given: L = 250 mm and…

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Q: The liquid limit and plastic limit of the soil is given as 46% and 23% respectively. The plasticity…

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Q: Water flows through a sand filter as shown on the figure. The soil has a cross sectional area of…

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Q: Given for a soil stratum: Coefficient of permeability in horizontal direction = 3 m/day Coefficient…

A: given Coefficient of permeabiity in horizontal direction-kh=3 m/dayandCoefficient of permeabiity in…

Q: A bed of sand consists of three horizontal layers of equal thickness. The value of k for the upper…

A:

Q: Situation 10: A soil sample has water content of 25%, degree of saturation of 80%, and specific…

A: Given data : Degree of saturation (S)=80100=0.8Water content (w)=25100=0.25Specific gravity…

Sediment transport

Sediment transport or Soil transport is the movement of solid particles, usually due to the combination of gravitational forces acting on the sediment, and the movement of the liquid at which the sediment enters. Soil erosion occurs in natural systems where the particles are sandstones (sand, rocks), mud, or clay; the liquid is air, water, or ice; and the gravitational force that works to move particles to the landing surface. Sediment transportation or soil migration due to the movement of liquids occurs in rivers, lakes, lakes, oceans, and other bodies of water as a result of currents and waves. Transportation is also caused by glaciers as they flow, and to places on earth under the influence of wind. Soil erosion due to gravity alone is possible in most sloping areas, including hills, scarves, cliffs, and the continental shelf — the continental boundary of the slope.