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Phase 5 Nutrient Land Calibration. Jing Wu 01/25/2006 Modeling Subcommittee. Nutrient land calibration. Edge of Field. Calibrated Edge of Field (EOF) loading to targets for each land use Identify sensitive parameters Develop decision rules Develop automatic calibration method.

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phase 5 nutrient land calibration

Phase 5 Nutrient Land Calibration

Jing Wu

01/25/2006

Modeling Subcommittee

nutrient land calibration
Nutrient land calibration

Edge of Field

  • Calibrated Edge of Field (EOF) loading to targets for each land use
    • Identify sensitive parameters
    • Develop decision rules
    • Develop automatic calibration method
land uses simulated
9 non-Ag land uses

Forest

Harvested Forest

Low Intensity Pervious Urban

High Intensity Pervious Urban

Low Intensity Impervious Urban

High Intensity Impervious Urban

Bare-construction

Extractive

Natural Grass

16 Ag land uses

High Till with manure

Nut Man High Till with manure

Low Till with Manure

Nut Man Low Till with manure

High Till without manure

Nut Man High Till without manure

Hay with nutrients

Nut Man Hay with nutrients

Hay without nutrients

Alfalfa

Nut Man Alfalfa

Pasture

Nut Man Pasture

Trampled

Animal Feeding Operations

Nursery

Land Uses Simulated
nutrient targets for each land use
Nutrient targets for each land use
  • Targets for NO3, NH3, and Organic N estimated based on Phase 4 model results and literature values
  • One single value for each non-agricultural land use/each pollutant
  • Spatial varied targets for agricultural land uses
slide5

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Nitrogen Cycle in Watershed Model

(After HSPF documentation)

Trees

Denitrification

Roots

Leaves

Nitrate

Atmospheric Deposition

Particulate

Particulate

Solution

Labile

Refractory

Ammonia

Organic N

Organic N

Solution

Solution

Adsorbed

Refractory

Labile

Ammonia

Organic N

Organic N

slide6

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Nitrogen Cycle in Watershed Model

(After HSPF documentation)

Trees

Denitrification

KDNI

Roots

Leaves

Nitrate

Atmospheric Deposition

KNI

Particulate

Particulate

Solution

KIMAM

Labile

Refractory

Ammonia

Organic N

Organic N

KVOL

KAM

KLON

KRON

Solution

Solution

Adsorbed

Refractory

Labile

Ammonia

Organic N

Organic N

slide7

Nitrogen Cycle in Watershed Model

(After HSPF documentation)

Trees

Denitrification

NO3

TN

KDNI

Roots

Leaves

Nitrate

NH3 / NO3 split

KNI

DIN / ORGN split

TN

Particulate

Particulate

Solution

KIMAM

Labile

Refractory

Ammonia

Organic N

Organic N

KVOL

KAM

KLON

KRON

NH3

TN

DIN / ORGN split

TN

LORGN

TN

RORGN

TN

Solution

Solution

Adsorbed

Refractory

Labile

Ammonia

Organic N

Organic N

calibration strategies
Calibration strategies

Two parallel strategies tried:

I. Calibrated to three targets: NH3, NO3 and ORGN

II. Targets break into surface and below surface, and Organic N separated to labile and refractory

Total eight targets: SNH3, BNH3, SNO3, BNO3, SLON, BLON, SRON, BRON

calibration strategy 3 targets
Calibration Strategy – 3 Targets

}

SURFACE

INTERFLOW

NH3

NO3

ORGN

Groundwater

calibration strategy 8 targets
Calibration Strategy – 8 Targets

NH3

NO3

Labile ORGN

Refractory ORGN

}

SURFACE

INTERFLOW

NH3

NO3

Labile ORGN

Refractory ORGN

Groundwater

slide11

Strategy I – three targets

  • Decision rules developed to relate sensitive parameters to three targets

KAM ~ Inorganic N targets /simulated

KIMAM ~ simulated Inorganic N/ targets

KNI ~ (simulated NH3/NO3)/(NH3 targets/NO3)

KDNI ~ simulated NO3/NO3 targets

KLON/KRON ~ Org N targets /simulated

If Organic N OK, but low NO3 and high NH3 -

KVOL ~ simulated NH3/NH3 targets

slide12
Program written to automatically calibrate all land uses/all segments
  • Sample results show how the methodology works

land use: harvest forest

targets: NH3 = 0.208

NO3 = 14

ORGN= 5.79

land calibration results nh3
Land calibration results – NH3

% of land segments reached targets

Land use

land calibration results no3
Land calibration results – NO3

% of land segments reached targets

Land use

land calibration results org n
Land calibration results – Org N

% of land segments reached targets

Land use

observations from strategy i
Observations from Strategy I
  • Overall, the methodology works for about half of land segments
  • Different land uses experiencing different problems
  • Better decision rules or changes in targets, application data, etc, needed to improve land calibration
possible solutions for strategy i
Possible solutions for Strategy I

Different land uses need different solutions:

  • Forest - over-simulated ORGN,under-simulated NH3, mixed results for NO3.

- decrease ORGN storage, check InorgN/orgn balance

  • Urban - reached ORGN targets, but under-simulated NH3 and NO3.

- change targets or application data for NH3 and NO3

  • Crop - mixed results.
  • Hay - mixed results.
  • Pasture - mixed results.

- change decision rules, targets, application data, or uptake rate

slide19

Strategy II – eight targets

  • Same sensitivity results, only

- Parameters in the first two layers affected surface loading

- Parameters in the 3rd and 4th layer affected below surface loading

  • Decision rules developed to relate each target to relevant parameters

Two set of decision rules developed

1 no if rules
1. ‘No-if’ rules
  • Adjust KAM and KIMAM to reach balance between Org N and Inorganic N
  • Adjust KNI and KDNI (below surface ONLY) to reach NH4 and NO3
  • Adjust KLON and KRON to reach Org N
some preliminary observations
Some preliminary observations:
  • The Rules tested for all land uses/all segments
  • Only run five rounds, not enough to reach a conclusion
  • Preliminary results show the rules work better for below surface than surface
  • The target break-up needs further look
2 with if rules
2. ‘ with-if’ rules
  • For surface, use the rule 1
  • For below surface -

1)Adjust KLON, KRON, KAM, and KIMAM to reach Organic N

2) If Organic N targets reached, then adjust KNI and KDNI to reach NH4 and NO3

preliminary observations
Preliminary observations:
  • The rules work better for below surface than surface, better for forest than high tillage
  • Balance between NH3 and NO3 hard to reach, particularly for surface layers
  • Need to test on other land uses
overall thoughts
Overall thoughts…
  • Refine calibration rules to improve land calibration
  • Possible changes in targets, application data and initial storage
  • Different rules may be necessary for different land uses