data/sediment_README_dictionary.csv

field,section,description
Sample_ID,Sampling & Geospatial Information,Unique alphanumeric identifier for each sampling site.
Date_and_time,Sampling & Geospatial Information,Timestamp of field sampling (YYYY-MM-DD HH:MM:SS).
Sampler,Sampling & Geospatial Information,Name of the personnel who collected the sample.
WGS84_Lat,Sampling & Geospatial Information,Latitude in the WGS84 coordinate system (Decimal Degrees).
WGS84_Lon,Sampling & Geospatial Information,Longitude in the WGS84 coordinate system (Decimal Degrees).
twd97_E,Sampling & Geospatial Information,Easting in the TWD97 (Taiwan Datum 1997) projected coordinate system (m).
twd97_N,Sampling & Geospatial Information,Northing in the TWD97 projected coordinate system (m).
Bulk_Dish_g,Bulk Sample Preparation & Field Moisture,Weight of the empty container (W1) used for the bulk soil sample (g).
Bulk_Wet_Soil_Dish_g,Bulk Sample Preparation & Field Moisture,Weight of the container plus the wet bulk soil (W2) immediately retrieved from the field (g).
Bulk_AirDry_Soil_Dish_g,Bulk Sample Preparation & Field Moisture,Weight of the container plus the bulk soil (W3) after prolonged laboratory air-drying preparation (g).
Bulk_Apparent_Moisture_pct,Bulk Sample Preparation & Field Moisture,"Apparent field moisture content (w), calculated prior to sieving: [(W2 - W3) / (W3 - W1)] x 100 (%)."
Specific_Gravity_Gs,Specific Gravity & Hydrometer Calibration,"Specific gravity of soil solids (Gs), measured via pycnometer or assigned based on spatial proximity."
Hydro_Sample_AirDry_g,Specific Gravity & Hydrometer Calibration,Weight of the air-dried fine soil fraction prepared for the hydrometer sedimentation test (g).
Hygro_Dish_g,Specific Gravity & Hydrometer Calibration,Weight of the empty weighing bottle used for hygroscopic moisture determination (g).
Hygro_Wet_Soil_Dish_g,Specific Gravity & Hydrometer Calibration,Weight of the weighing bottle plus air-dried fine soil before oven-drying (g).
Hygro_Dry_Soil_Dish_g,Specific Gravity & Hydrometer Calibration,Weight of the weighing bottle plus absolute dry soil (g).
Air_Dry_Moisture_pct,Specific Gravity & Hydrometer Calibration,Hygroscopic moisture content of the air-dried fines (%).
Hydro_Absolute_Dry_Soil_g,Specific Gravity & Hydrometer Calibration,"Absolute oven-dry mass of the soil used in the hydrometer test (Ws), corrected as: [Air-dry mass / (1 + Hygroscopic moisture)] (g)."
Hydro_Time_min,Sedimentation (Hydrometer) & Sieve Analysis,Array of elapsed observation times during the hydrometer test (min).
Hydro_Reading,Sedimentation (Hydrometer) & Sieve Analysis,Array of uncorrected hydrometer readings (R) corresponding to the elapsed times.
Hydro_Temp_C,Sedimentation (Hydrometer) & Sieve Analysis,Array of suspension temperatures recorded at each hydrometer reading (deg C).
Sieve_Opening_mm,Sedimentation (Hydrometer) & Sieve Analysis,Array of standard sieve opening sizes used in the mechanical sieve analysis for coarse fractions (mm).
Sieve_Retained_g,Sedimentation (Hydrometer) & Sieve Analysis,Array of the mass of dry soil retained on each respective standard sieve (g).
Gravel_pct_75_to_4_75mm,Particle Size Fractions,"Percentage of Gravel (75 mm > D >= 4.75 mm, retained on No.4 sieve) (%)."
Coarse_Sand_pct,Particle Size Fractions,Percentage of Coarse Sand (4.75 mm > D >= 2.0 mm) (%).
Medium_Sand_pct,Particle Size Fractions,Percentage of Medium Sand (2.0 mm > D >= 0.425 mm) (%).
Fine_Sand_pct,Particle Size Fractions,Percentage of Fine Sand (0.425 mm > D >= 0.075 mm) (%).
Silt_pct_0_075_to,Particle Size Fractions,"Percentage of Silt (0.075 mm > D >= 0.005 mm, passing No.200 sieve) (%)."
Clay_pct_lt_0_005mm,Particle Size Fractions,Percentage of Clay (D < 0.005 mm) (%).
Curve_Size_mm,Gradation Curve & Index Properties,Array of merged particle diameters (D) derived from both sieve and hydrometer analyses (mm).
Curve_Passing_pct,Gradation Curve & Index Properties,Array of cumulative percent passing corresponding to each particle diameter (%).
D60_mm,Gradation Curve & Index Properties,Particle diameter at 60% passing (D60) (mm).
D50_mm,Gradation Curve & Index Properties,Median particle diameter (D50) at 50% passing (mm).
D30_mm,Gradation Curve & Index Properties,Particle diameter at 30% passing (D30) (mm).
D10_mm,Gradation Curve & Index Properties,Effective particle diameter (D10) at 10% passing (mm).
Cu,Gradation Curve & Index Properties,"Coefficient of Uniformity (Cu = D60 / D10), evaluating the gradation spread."
Cc,Gradation Curve & Index Properties,"Coefficient of Curvature [Cc = (D30^2) / (D10 x D60)], evaluating the gradation symmetry."