Grantee Research Project Results
2003 Progress Report: Mechanistic-based Watershed Modeling for Evaluation of Ecosystem Conditions
EPA Grant Number: R827956Title: Mechanistic-based Watershed Modeling for Evaluation of Ecosystem Conditions
Investigators: Yeh, Gour-Tsyh
Current Investigators: Yeh, Gour-Tsyh , Schayek, Lily , Gwo, J. P.
Institution: University of Central Florida
Current Institution: Pennsylvania State University
EPA Project Officer: Packard, Benjamin H
Project Period: January 10, 2000 through September 30, 2003 (Extended to September 30, 2005)
Project Period Covered by this Report: January 10, 2003 through September 30, 2004
Project Amount: $888,637
RFA: Computing Technology for Ecosystem Modeling (1999) RFA Text | Recipients Lists
Research Category: Environmental Statistics
Objective:
The objectives of this research project are to:
- improve the robustness and accuracy of WASH123D;
- provide a visualization/user interface with selected modeling environments;
- perform high performance computing with several hardware architectures;
- and verify and validate numerical modeling software.
Progress Summary:
The progress during this reporting period is described according to the tasks identified in the original proposal.
Task 1
The major work elements in this task are: (1) improvement in the design capability of WASH123D; (2) rigorous coupling among media; (3) computational algorithms; and (4) a new paradigm of modeling water quality. To improve the design capability, it was necessary to include thermal and salinity transport. This new design capability is nearly complete (Yeh, et al., 2003a). A rigorous coupling among media has been completed in this reporting period (Yeh, et al., 2003b). The most intrinsic task in the rigorous coupling is the handling of various time scales in river networks, overland regime, and subsurface media. The rigorous implementation of interactions is necessary because how the coupling is made will have a significant effect on computational time. For example, new coupling strategies among all river reaches at junctions have accelerated at least 10 times in the one-dimensional river network computations (Wanielista, et al., 2003). The development of innovative convective algorithms was performed in the last two reporting periods. This work has continued and has resulted in the submission of three articles (Zhang, et al., submitted, 2003; Suk and Yeh, submitted, 2003a; Suk and Yeh, submitted, 2003b) and the acceptance of one paper (Yeh and Zhang, 2004). The improvement in the water quality module with a new paradigm (Fang, et al., 2003) has been completed for the river network and overland regime in this report period. Two articles (Zhang and Yeh, to be submitted, 2004a; Zhang and Yeh, to be submitted, 2004b) are in the final stage of completion.
Task 2
The development of pre- and postprocessing for WASH123D using the U.S. Department of Defense Groundwater Modeling System has been completed, and a draft report is in preparation. This work was a collaborative effort between the principal investigator and the Engineering Research and Development Center (ERDC) of the U.S. Army Corps of Engineers (USACE) at Vicksburg, Mississippi. The pre- and postprocessing for WASH123D were conducted jointly by Ph.D. students from the University of Central Florida (UCF) and a USACE contractor. The USACE contractor performs the interface, and the UCF students conduct the applications.
Task 3
The results from this effort indicate that block-wise decomposition strategies remain preferable. Particularly, the results of this research suggest that a hybrid of METIS partitioning and load-balancing heuristics for the algebraic multigrid solver in the event of heterogeneous and anisotropic conditions may be desirable. Parallelization was performed for routines that maintain and calculate the pointer and boundary arrays, making this portion of the parallel WASH123D code more scalable. One paper was published on this task (Gwo and Yeh, 2003). Along with the parallelization of the I/O and pointer array sections of WASH123D, we conducted a preliminary study of the parallel library PETSC, which will be used to implement a parallel linear solver in the Eulerian step and particle tracking in the Lagrangian step of WASH123D. This task was carried out by Dr. J.P. Gwo at the University of Maryland via a subcontract. The parallel linear solver is being implemented into the two- and three-dimensional flow simulation sections. Initial comparison of solutions from the indigenous ILUCG and that of the PETSC indicates highly comparable results (with the second norm of solution difference in the order of 10-5).
Furthermore, because of the necessity of high performance computing in applying WASH123D to the lower east coast (LEC) and CN111 projects by USACE, a senior scientist at the ERDC, Dr. Ruth Cheng, also is conducting research to parallelize the code WASH123D in parallel to Dr. Gwos effort. Her efforts have resulted in two papers (Cheng, et al., 2003a; Cheng, et al., 2003b).
Task 4
The verification and validation of the interim version of WASH123D have been conducted with two applications: the Loxahatchee River watershed and the CN111 watershed in south Florida. These applications resulted in two papers (Huang and Yeh, 2004; Lin, et al., 2004). They demonstrate the versatility of WASH123D and its efficiency to field problems. A preliminary application also was conducted for the LEC wetland management project in the Comprehensive Everglade Restoration Program, which resulted in one publication (Lin, et al., 2003). Final application of WASH123D to the B iscayne Bay watershed in south Florida is being initiated.
Future Activities:
The activities to be conducted in the next reporting period are to:
- Complete the final report on WASH123D Version 2.0. A nearly completed draft report was sent to Dr. James C. Moore, U.S. Environmental Protection Agency (EPA) Project Officer, prior to this annual report.
- Complete a new three-dimensional water quality module based on the new paradigm for subsurface media.
- Incorporate new one-, two-, and three-dimensional water quality modules into WASH123D.
- Prepare a draft report on WASH123D Version 3.0. This, along with WASH123D Version 2.0, will be the final product delivered to EPA.
- Prepare seven journal articles on WASH123D. The tentative titles of these seven articles are as follows: (1) A Numerical Watershed Model: 1. Overall Structures and Design Capabilities; (2) A Numerical Watershed Model: 2. Various Approaches To Numerically Modeling Hydrodynamics in River/Stream Network With Control Structures and Pumps; (3) A Numerical Watershed Model: 3. Various Approaches To Numerically Modeling Surface Runoff With Storage Ponds and Control Structures; (4) A Numerical Watershed Model: 4. A Reaction-Based Numerical Model of Biogeochemical Transport in the Subsurface Media; (5) A Numerical Watershed Model: 5. Reactive Chemical Transport Modeling in River/Stream Networks and Surface Runoff; (6) A Numerical Watershed Model: 6. Sediment Transport Modeling in River/Stream Networks and Surface Runoff; and (7) A Numerical Watershed Model: 7. Numerical Modeling of Fluid Flows and Sediment and Reactive Chemical Transport in a Watershed of River/Stream Networks, Overland, and Subsurface Media.
Journal Articles on this Report : 2 Displayed | Download in RIS Format
Other project views: | All 51 publications | 12 publications in selected types | All 7 journal articles |
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Type | Citation | ||
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Fang Y, Yeh G-T, Burgos WD. A general paradigm to model reaction-based biogeochemical processes in batch systems. Water Resources Research 2003;39(4):HWC21-HWC225. |
R827956 (2003) R827956 (Final) |
Exit Exit |
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Zhang F, Jiang L, Yeh GT, Parker JC. An adaptive local grid refinement and peak/valley capture algorithm to solve nonlinear transport problems with moving sharp-fronts. Transport in Porous Media 2008;72(1):53-69. |
R827956 (2000) R827956 (2003) |
Exit Exit |
Supplemental Keywords:
watershed modeling, first principle-based model, numerical modeling, fully dynamic wave, surface runoff, subsurface flow, river hydrodynamics, reactive chemical transport, sediment transport, high-performance computing,, RFA, Scientific Discipline, Toxics, Waste, Water, Ecosystem Protection/Environmental Exposure & Risk, Hydrology, Nutrients, Ecology, Contaminated Sediments, Mathematics, Environmental Chemistry, Ecosystem/Assessment/Indicators, Ecosystem Protection, Chemistry, pesticides, Fate & Transport, computing technology, Wet Weather Flows, Biology, Ecological Indicators, hydrological stability, aquatic ecosystem, nutrient transport, ecosystem modeling, fate and transport, ecological exposure, high performance computing, computer simulation model, streams, watershed, mechanistic based watershed modeling, ecological modeling, sediment transport, contaminated sediment, ecosystem evaluation, numerical models, sediment, mechanistic-based watershed modeling, watershed modeling, industrial chemicals, tidal influence, computer science, tidal water bodies, microbial pollution, numerical model, bioindicators, subsurface media, component-based software, information technology, water quality, lake ecosystemsProgress and Final Reports:
Original AbstractThe perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.