Modeling Phosphorus Transport in Grass Buffer Strips

Lee, Dowon; Dillaha, Theo A.; Sherrard, Joseph H.

doi:10.1061/(asce)0733-9372(1989)115:2(409)

Cited by 54 publications

(34 citation statements)

References 16 publications

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“…The inorganic phosphorous is divided into two types, the ESIP and the FIP (an assumption similar to that in SWAT model). The P in overland flow is carried in two forms, the dissolved P (DP) and the particulate P (PP) (Lee et al, 1989). Therefore in total there are seven P state variables of which two represent the P forms that exist in the overland flow.…”

Section: Mathematical Formulation Of P Processes In the Gopcmentioning

confidence: 99%

“…Furthermore the initial values for the soil P variables are all set to zero. Table ( (Lee et al, 1989) (3): SWAT model (Arnold et al, 1998), (4): HSPF model (Donigian et al, 1984), (5) : Oddson, et al, (1970). On running the hydrological model (SHETRAN) on the catchment, a significant water depth (>0.005m) resulted in elements 2, 4, and 1 while the remaining two elements (3, and 5) recorded a practical zero water depth (<0.005m).…”

Section: An Example Of the Gopc Applicationmentioning

confidence: 99%

“…In most of the nonpoint pollution models overland flow transport of the detached P is generally described by empirical or crude relations, however the only probable comprehensive model to reproduce this process was developed by Lee et al, (1989). That model considers the effects of advection, infiltration, biological decay and uptake, the kinetics of chemical desorption from the soil surface to storm water, the adsorption kinetics of dissolved phosphorous to sediment in runoff, and the dynamic changes of sediment size fractions on chemical transport.…”

Section: Introductionmentioning

confidence: 99%

“…As it has been classified by Stevenson and Cole, (1999) the soil P compounds comprise of soluble inorganic and organic P, weakly adsorbed (labile) inorganic P, sparingly soluble P, insoluble organic P, strongly adsorbed and/or occluded P by hydrous oxides of Fe and Al, and fixed P of silicate minerals. The detached and dissolved P compounds from the parent material can be transported by the storm runoff in which they normally exist in dynamic equilibrium between the dissolved and sediment-bound or particulate forms (Lee et al, 1989). …”

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confidence: 99%

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Developing an independent, generic, phosphorus modelling component for use with grid-oriented, physically based distributed catchment models

Nasr

Taskinen

Bruen

2005

Water Science and Technology

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Grid-oriented, physically based catchment models calculate fields of various hydrological variables relevant to phosphorous detachment and transport. These include (i) for surface transport: overland flow depth and flow in the coordinate directions, sediment load, and sediment concentration and (ii) for subsurface transport: soil moisture and hydraulic head at various depths in the soil. These variables can be considered as decoupled from any chemical phosphorous model since phosphorous concentrations, either as dissolved or particulate, do not influence the model calculations of the hydrological fields. Thus the phosphorous concentration calculations can be carried out independently from and after the hydrological calculations. This makes it possible to produce a separate phosphorous modelling component which takes as input the hydrological fields produced by the catchment model and which calculates, at each step the phosphorous concentrations in the flows. This paper summarise the equations and structure of Grid Oriented Phosphorous Component (GOPC) developed for simulating the phosphorus concentrations and loads using the outputs of a fully distributed physical based hydrological model. Also the GOPC performance is illustrated by am example of an experimental catchment (created by the author) subjected to some ideal conditions. Keywords: Phosphorous modelling; Soil phosphorous, Phosphorus transport; Grid Oriented Phosphorous Component IntroductionModelling of phosphorous (P) loss from agriculture land and its transport consists of two parts. The first part deals with simulating most of the chemical transformations and movements in the soil phosphorous cycle, whereas the second part focuses on the transport of phosphorous over and beneath the land surface until it reaches the water bodies. As it has been classified by Stevenson and Cole, (1999) the soil P compounds comprise of soluble inorganic and organic P, weakly adsorbed (labile) inorganic P, sparingly soluble P, insoluble organic P, strongly adsorbed and/or occluded P by hydrous oxides of Fe and Al, and fixed P of silicate minerals. The detached and dissolved P compounds from the parent material can be transported by the storm runoff in which they normally exist in dynamic equilibrium between the dissolved and sediment-bound or particulate forms (Lee et al., 1989).

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Section: Mathematical Formulation Of P Processes In the Gopcmentioning

confidence: 99%

Section: An Example Of the Gopc Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Developing an independent, generic, phosphorus modelling component for use with grid-oriented, physically based distributed catchment models

Nasr

Taskinen

Bruen

2005

Water Science and Technology

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“…A large number of models have been developed. Some of the most physically based ones, including more detailed descriptions of the processes, for example, have been the model of Simons et al (1975), LANDRUN (Novotny et al, 1978), GRASSF (Hayes et al, 1984), GRAPH (Lee, 1987), SHESED (Wicks, 1988;Bathurst and Wicks, 1991;Wicks and Bathurst, 1996), WEPP (Nearing et al, 1989), KINEROS (Woolhiser et al, 1990) and the approaches of Rose (1991, 1992a,b). These models and many others have been used in many applications with promising results.…”

Section: Introductionmentioning

confidence: 99%

Incremental distributed modelling investigation in a small agricultural catchment: 2. Erosion and phosphorus transport

Taskinen

Bruen²

2006

Hydrological Processes

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Abstract:Distributed physically based erosion and phosphorus (P) transport models, run by the overland flow model described in Taskinen and Bruen (2006. Hydrological Processes 21(1)), are described. In the erosion model, the additional components to the basic model were the outflow of the particles by infiltration and a new model component, i.e. deposition when rainfall stops. Two ways of calculating the shielding factor due to the flow depth were compared. The P transport model had both dissolved P (DP) and particulate P (PP) components. The processes included in the DP model were desorption from the soil surface, advection, storage in the overland flow and infiltration. The PP model accounted for advection, storage in the flow, infiltration, detachment from the soil surface by flow and rainfall and deposition both when transport capacity of suspended solids (SS) is exceeded and when rainfall ceases. When the models were developed and validated in small agricultural fields of cohesive soil types in southern Finland, comparisons were made between corresponding processes and the significance of added components were estimated in order to find out whether increased model complexity improves the model performance. The sedigraphs were found to follow the dynamics of rainfall, emphasizing the importance of the rainfall splash component. The basic model was too slow to react to changes in rainfall and flow rates, but infiltration and deposition that acts during the cessation in rainfall improved the model significantly by enabling the modelled SS to fall sharply enough. The shielding effect of flow depth from the splash detachment was found to play a significant role. Transport capacity should also be included in erosion models when they are applied to cohesive soils. In this study, the Yalin method worked well. A strong correlation was obvious between the measured SS and total P concentrations, indicating that the main form of P in runoff is PP. This emphasizes the importance of a good sediment transport model in P transport modelling. The submodel used for DP desorption from the soil surface produced plausible results without any calibration.

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Contribution of Nitrogen Species and Phosphorus Fractions to Stream Water Quality in Agricultural Catchments

1996

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The contribution from agricultural catchments to stream nitrogen and phosphorus concentrations was assessed by evaluation of the chemical composition of these nutrients in agricultural runoff for both surface and subsurface flow pathways. A range of land uses (grazed and ungrazed grassland, cereals, roots) in intensive agricultural systems was studied at scales from hillslope plots (05m') to large catchment (>300km2). By fractionating the total nutrient load it was possible to establish that most of the phosphorus was transported in the unreactive (particulate and organic) fraction via surface runoff. This was true regardless of the scale of measurement. The form of the nitrogen load varied with land use and grazing intensity. High loads of dissolved inorganic nitrogen (with >90% transported as NH4-N) were recorded in surface runoff from heavily grazed land. In subsurface flow from small (2km') subcatchments and in larger (>300 km') catchments, organic nitrogen was found to be an important secondary constituent of the total nitrogen load, comprising 40% of the total annual load.

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Modeling Phosphorus Transport in Grass Buffer Strips

Cited by 54 publications

References 16 publications

Developing an independent, generic, phosphorus modelling component for use with grid-oriented, physically based distributed catchment models

Developing an independent, generic, phosphorus modelling component for use with grid-oriented, physically based distributed catchment models

Incremental distributed modelling investigation in a small agricultural catchment: 2. Erosion and phosphorus transport

Contribution of Nitrogen Species and Phosphorus Fractions to Stream Water Quality in Agricultural Catchments

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