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This module explores sediment transport and phytoplankton interactions within eutrophic aquatic systems using the WASP7 model. It covers key processes such as settling, respiration, growth, and dissolution of biotic and inorganic solids. The module incorporates various parameters, including production rates, sedimentation velocities, and transport dynamics, to simulate the impact of solids on nutrient cycling and ecosystem health. It includes tools for sensitivity analysis and performance evaluation of sediment transport scenarios, providing essential insights for environmental management.
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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
