EVALUATION OF PREFERENTIAL FLOW COMPONENT OF RZWQM IN SIMULATINGWATER AND ATRAZINE TRANSPORT TO SUBSURFACE DRAINS

1998 ◽  
Vol 41 (3) ◽  
pp. 627-637 ◽  
Author(s):  
A. Kumar ◽  
R. S. Kanwar ◽  
L. R. Ahuja
Keyword(s):  
Preferential Flow ◽  
Flow Component ◽  
Subsurface Drains

Using Simple Bucket Models to Analyze Solute Export to Subsurface Drains by Preferential Flow

2003 ◽  
Vol 2 (1) ◽  
pp. 68-75 ◽  
Author(s):  
A. Kohler ◽  
K. C. Abbaspour ◽  
M. Fritsch ◽  
R. Schulin
Keyword(s):  
Preferential Flow ◽  
Subsurface Drains

DRAINMOD-P: A Model for Simulating Phosphorus Dynamics and Transport in Drained Agricultural Lands: II. Model Testing

2021 ◽  
Vol 64 (6) ◽  
pp. 1849-1866
Author(s):  
Manal H. Askar ◽  
Mohamed A. Youssef ◽  
Dean L. Hesterberg ◽  
Kevin W. King ◽  
Aziz Amoozegar ◽  
...  
Keyword(s):  
Surface Runoff ◽  
Preferential Flow ◽  
Model Performance ◽  
Water Quality Modeling ◽  
List Type ◽  
Macropore Flow ◽  
Major Pathway ◽  
Phosphorus Loss ◽  
Particulate Form ◽  
Subsurface Drains

HighlightsDRAINMOD-P was tested using a dataset from a drained field with desiccation cracks.Surface and subsurface phosphorus losses were mainly in the particulate form.Surface runoff was a major pathway for phosphorus loss in this field.The model performance in predicting edge-of-field phosphorus loss is promising.Abstract. The recently developed phosphorus (P) model DRAINMOD-P was tested using a four-year dataset from a subsurface-drained field in northwest Ohio with significant potential for desiccation cracking or preferential flow. The model satisfactorily predicted subsurface drainage discharge, with a monthly Nash-Sutcliffe efficiency (NSE) of 0.59 and index of agreement (IOA) of 0.89. Lack of annual water budget closure was reported and was likely caused by uncertainty in measured surface runoff and/or modeling approaches representing macropore flow. More than 80% of predicted surface and subsurface P losses were in the particulate form. Surface runoff was the major pathway for P loss, contributing 78% of predicted total P (TP) load. On average, predicted macropore flow represented about 15% of drainage discharge and contributed 21% of DRP loss via subsurface drains. The performance of DRAINMOD-P in predicting monthly dissolved reactive P and TP losses through subsurface drains can be rated as poor (NSE = 0.33 and IOA = 0.60) and very good (NSE = 0.81 and IOA = 0.95), respectively. DRAINMOD-P demonstrated potential for simulating P fate and transport in drained cropland. More testing is needed to further examine newly incorporated hydrological and biogeochemical components of the model. Keywords: Agricultural drainage, Edge-of-field phosphorus load, Macropore flow, Phosphorus model, Sediment yield, Water quality modeling.

Partitioning of preferential flows in fracture networks: Smoothed Particle Dynamics simulations and analytical modeling of infiltration dynamics

2020 ◽  
Author(s):  
Jannes Kordilla ◽  
Marco Dentz ◽  
Alexandre Tartakovsky
Keyword(s):  
Porous Media ◽  
Preferential Flow ◽  
Contact Angles ◽  
Single Fracture ◽  
Vertical Flow ◽  
Fracture Networks ◽  
Diffuse Infiltration ◽  
Flow Component ◽  
Fracture Intersection ◽  
Smoothed Particle

<p>Recharge estimation in fractured-porous aquifers is an essential tool for proper water management and assessment of vulnerability. As opposed to diffuse infiltration, often encountered in consolidated and unconsolidated porous media, the infiltration dynamics in the unsaturated zone of fractured-porous media and karst aquifers often exhibit a rapid, gravity-driven flow component along preferential flow paths such as fractures, fracture networks, faults and fault zones. The partitioning into two hydraulically contrasting domains commonly leads to a breakdown of classical volume-effective flow equations employed in many FD or FEM modeling approaches which only consider the capillarity of the medium. Even in the presence of a porous matrix, preferential pathways along fractures have been shown to sustain flow percolation under equilibrium and non-equilibrium conditions. In order to properly capture the flow physics, various components have to be considered such as static and dynamic contact angles, surface tension, free-surface (multi-phase) interface dynamics, dynamic switching of flow modes (between droplets, rivulets, films) and associated formation of singularities in the case of merging or snapping flow. Here we study the process of vertical infiltration and partitioning at a single fracture intersection into a horizontal and vertical flow component. Via parallelized Smoothed Particle Hydrodynamics simulations we demonstrate how flow is first channeled into the horizontal fracture and then transitions into a Washburn-type inflow when pressure conditions are met and a connection to the next vertical flow path is established. We further proceed to capture this process with an analytical approach and finally demonstrate how to obtain a process-based transfer function to upscale this process to arbitrary fracture geometries and fracture cascades.</p>

Using Simple Bucket Models to Analyze Solute Export to Subsurface Drains by Preferential Flow

2003 ◽  
Vol 2 (1) ◽  
pp. 68 ◽  
Author(s):  
A. Kohler ◽  
K. C. Abbaspour ◽  
M. Fritsch ◽  
R. Schulin
Keyword(s):  
Preferential Flow ◽  
Subsurface Drains

Using Simple Bucket Models to Analyze Solute Export to Subsurface Drains by Preferential Flow

2003 ◽  
Vol 2 (1) ◽  
pp. 68-75 ◽  
Author(s):  
A. Kohler ◽  
K. C. Abbaspour ◽  
M. Fritsch ◽  
R. Schulin
Keyword(s):  
Preferential Flow ◽  
Subsurface Drains

Visualizing Preferential Flow Paths using Ammonium Carbonate and a pH Indicator

2002 ◽  
Vol 66 (2) ◽  
pp. 347 ◽  
Author(s):  
Zhi Wang ◽  
Jianhang Lu ◽  
Laosheng Wu ◽  
Thomas Harter ◽  
William A. Jury
Keyword(s):  
Preferential Flow ◽  
Ammonium Carbonate ◽  
Ph Indicator ◽  
Flow Paths ◽  
Preferential Flow Paths

Equation for Describing Solute Transport in Field Soils with Preferential Flow Paths

2005 ◽  
Vol 69 (2) ◽  
pp. 291-300 ◽  
Author(s):  
Young-Jin Kim ◽  
Christophe J. G. Darnault ◽  
Nathan O. Bailey ◽  
J.-Yves Parlange ◽  
Tammo S. Steenhuis
Keyword(s):  
Solute Transport ◽  
Preferential Flow ◽  
Flow Paths ◽  
Preferential Flow Paths ◽  
Field Soils
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