Accurate predictions of sediment yield from distributed models of runoff and sediment yield depends in part of how well matched the model structure is to input data spatial representation. This study investigated how model structure and input data representation affect sediment predictions made using the Soil and Water Assessment Tool (SWAT). The study focused on the integration of two specific...

The accuracy of agricultural nonpoint source pollution models depends in part on how well model input parameters describe the relevant characteristics of the watershed. The spatial extent of input parameter aggregation has previously been shown to have a substantial impact on model output. This study investigates this problem using the Soil and Water Assessment Tool (SWAT), a distributed-parame...

This study explored the application of a multi-objective evolutionary algorithm (MOEA) and Pareto ordering in the multiple-objective automatic calibration of the Soil and Water Assessment Tool (SWAT). SWAT was calibrated in the Calapooia watershed, Oregon, USA, with two different pairs of objective functions in a cluster of 24 parallel computers. The non-dominated sorting genetic algorithm (NSG...

Abstract. Over the past decade, there has been appreciable progress towards modeling water, energy, and carbon cycles at field scales (10–100 m) over continental to global extents in Earth system models (ESMs). One such approach, named HydroBlocks, accomplishes this task while maintaining computational efficiency via Hydrologic Response Units (HRUs), more commonly known as “tiles” ESMs. In thes...

In South Africa, with highly variable and intense land-use practices, coupled limited soil fertility water resources, there has been a long history of encroachment arable lands (sugarcane timber plantations) into surrounding wetlands. Although wetland delineation within the sugar sectors is well-defined in policy, existing proposed legislation, are significant areas non-compliance. The spatiall...

The Soil and Water Assessment Tool (SWAT) hydrological/water quality model divides a watershed into hydrological response units (HRUs) based on unique land cover, soil type, and slope. HRUs are a set of discontinuous land masses that are spatially located in the watershed but their responses are not tied to any particular field. Field_SWAT, a simple graphical user interface (GUI)-driven tool, w...

The supply and demand of ecosystem services their mutual feedback are important for the formulation basin ecological environmental policies. Simulation spatial flow can clarify division areas support policy development. This paper takes Jinghe Basin in Loess Plateau China as case-study area to simulate soil conservation service on different scales. results showed that (1) erosion situations imp...

Abstract. To date, most regional and global hydrological models either ignore the representation of cropland or consider crop cultivation in a simplistic way abstract terms without any management practices. Yet, water balance cultivated areas is strongly influenced by applied practices (e.g. planting, irrigation, fertilization, harvesting). The SWAT+ (Soil Water Assessment Tool) model represent...

Land use and management practice inputs to the Soil Water Assessment Tool (SWAT) are critical for evaluating impact of land change best practices on soil erosion water quality in watersheds. We developed an algorithm this study maximize usage records during setup SWAT a small experimental watershed New Brunswick, Canada. In algorithm, hydrologic response units (HRUs) were delineated based field...