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This document delves into the intricacies of sediment transport modeling using WASP7, focusing on vital elements such as phytoplankton dynamics, detritus, and inorganic solids. It encompasses the EUTRO-7 and TOXI-7 modules that address biotic solids kinetics, settling behaviors, and the dissolution processes of particulate matter. Critical parameters such as production rates, temperature corrections, and sedimentation velocities are outlined, providing essential insights into benthic interactions and nutrient cycling. This comprehensive overview aids in understanding aquatic ecosystems and improving water quality management strategies.
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Sediment Transport WASP7 Course
EUTRO-7 Module Phytoplankton (mg C/L) Detritus (mg C/L) Inorganic S (mg dw/L) TOXI-7 Module Inorganic Fines (mg dw/L) Sands (mg dw/L) Biotic Solids (mg dw/L) Solids State Variables
Settling Settling Respiration Settling EUTRO-7 Solids Kinetics Respiration Death Growth Phytoplankton Dissolution Detritus Periphyton Death Growth Inorganic Solids
Settling Settling Settling S2 - Sands TOXI-7 Solids Kinetics Dissolution (1-fash) Net Biotic S3 - Biotic Solids S1 - Inorganic Fines (fash) Production
TOXI-7 Biotic Solids Kinetic Data • Constants • Net biotic production rate, g dw/m3-day • Production temperature correction factor • Net detrital dissolution rate constant, day-1 • Dissolution temperature correction factor • Fraction ash free dry weight • Parameters • Production rate spatial scale multiplier • Dissolution rate spatial scale multiplier • Time Functions • Production rate time scale multiplier
TOXI-7 Solids Transport Data • Systems • Simulation option (simulate, constant, bypass) • Particulate transport field (Solids 1, Solids 2, Solids 3) • Particle density, g dw/mL (defaults to 2.65) • Maximum concentration, mg/L (reset to 3.0e6) • Flows • Flow field use (check Solids 1, Solids 2, or Solids 3) • Scale and conversion factors (internal units, m/sec) • Flow function (e.g., insert settling, resuspension) • Segment pairs • Surface area, m2 (under “fraction of flow”) • Settling or resuspension velocity versus time, m/sec
Implementation – Systems Data If unchanged, particle density defaults to 2.65 g/mL If unchanged, maximum concentration for solids defaults to 3.0e+6 mg/L
Implementation – Segment Data Input benthic volume, m3 Input benthic depth, m Specify segment type Map bottom segments
Implementation – Initial Conditions Silts, mg/L Sands, mg/L Biotic Solids, mg/L
Implementation – Flow Fields Point and press “Insert” twice
Implementation – Settling Data days/second surface area, m2 Settling velocity, m/day
Settling & Deposition Velocities g = acceleration of gravity = 981cm/sec2 m = absolute viscosity of water = 0.01 poise (g/cm2-sec) at 20oC dp = particle diameter, mm fine sand = 0.05 – 0.2 silt = 0.002 – 0.05 clay = 0.001 – 0.002 aD = probability of deposition upon contact with bed
Inflow Surface Water Depth, 1 m Surface Area, 104 m2 Water, 104 m3/day Silt, 60kg/day Sand, 40kg/day Surface Sediment, 2 cm Subsurface Sediment, 5 cm Pond Solids Example -External Parameters
TSS (Silt and POM) Internal Biotic Production, 2g/m3-day Deposition, 0.5 m/day Resuspension, 0.05 mm/day POM Dissolution, 0.004day-1 Sand, 1.0 g/mL, Silt and POM, 0 g/mL Sand, 1.5 g/mL, Silt and POM, 0 g/mL Pond Solids Example –Internal Parameters
