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نتیجه جستجو - Watershed modeling

تعداد مقالات یافته شده: 2
ردیف عنوان نوع
1 Projecting land use change impacts on nutrients, sediment and runoff in multiple spatial scales: Business-as-usual vs. stakeholder-informed scenarios
پیش بینی اثرات تغییر کاربری اراضی روی مواد مغذی ، رسوب و رواناب در مقیاس های مکانی مختلف: تجارت معمول در مقابل سناریوهای آگاه از ذینفعان-2020
While the impact of land use/land cover (LULC) change on watersheds has been extensively studied, little attention has been given to the variability of this impact with respect to the projected LULC scenarios at a range of spatial scales. Here, a spatial LULC change model was coupled with the Chesapeake Bay Watershed Model to investigate LULC change impact on nutrients (nitrogen and phosphorous) and sediment loads and runoff volume in northwestern Virginia, U.S. Using 2011 as the baseline scenario, we examined four stakeholder-informed future (50 years hence) LULC scenarios, which differed in projection of population growth and planning strategy, along with a ‘business-as-usual’ (BAU) scenario, which projected historical LULC trends into the future. Four LULCsdDeveloped, Forest, Grasses and Cropsdwere dynamically transitioned. The difference in projected nutrient and sediment loads and runoff volume between the LULC scenarios was greater at finer spatial scales, where planning decisions are most commonly made. The LULC change scenario with reactive planning and high population growth resulted in the largest increase in runoff volume, while the scenario with reactive planning and low population growth showed the largest increase in modeled nutrient and sediment loads. These results suggested that planning strategy plays a more critical role than population growth in watershed management.
Keywords: Land use/land cover change | Watershed modeling | Nutrient and sediment pollution | Surface runoff
مقاله انگلیسی
2 OpenMP Parallelization of a Gridded SWAT (SWATG)
OpenMP Parallelization of a Gridded SWAT (SWATG)-2017
Large-scale, long-term and high spatial resolution simulation is a common issue in environmental modeling. A Gridded Hydrologic Response Unit (HRU)-based Soil and Water Assessment Tool (SWATG) that integrates grid modeling scheme with different spatial representations also presents such problems. The time-consuming problem affects applications of very high resolution large-scale watershed modeling. The OpenMP (Open Multi-Processing) parallel application interface is integrated with SWATG (called SWATGP) to accelerate grid modeling based on the HRU level. Such parallel implementation takes better advantage of the computational power of a shared memory computer system. We conducted two experiments at multiple temporal and spatial scales of hydrological modeling using SWATG and SWATGP on a high-end server. At 500-m resolution, SWATGP was found to be up to nine times faster than SWATG in modeling over a roughly 2,000 km2 watershed with 1 CPU and a 15 thread configuration. The study results demonstrate that parallel models save considerable time relative to traditional sequential simulation runs. Parallel computations of environmental models are beneficial for model applications, especially at large spatial and temporal scales and at high resolutions. The proposed SWATGP model is thus a promising tool for large-scale and high-resolution water resources research and management in addition to offering data fusion and model coupling ability.
Keywords: grid | parallel | SWAT | hydrological model | OpenMP
مقاله انگلیسی
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