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Hydropedology

Bridging Disciplines, Scales, and Data

Dep. of Crop and Soil Sciences, 116 ASI Building, The Pennsylvania State University, University Park, PA 16802

View larger version (37K): [in a new window]   Fig. 1. Hydropedology: Integrating pedology, soil physics, and hydrology for holistic study of interactive pedologic and hydrologic processes and properties in the earth's surface and subsurface environments across a range of spatial and temporal scales.

View larger version (38K): [in a new window]   Fig. 2. Multiscale bridging in hydropedology: Connecting microscopic to mesoscopic and macroscopic levels. In the right-hand side of the figure, typical space and time dimensions are indicated in the parentheses for lab-, field-, and watershed-scales. REV is representative elementary volume, and REA is representative elementary area. The left-hand side figure is modified from Wilding (2000).

View larger version (41K): [in a new window]   Fig. 3. A conceptual diagram showing the relationships of hydropedology to other related disciplines.

View larger version (121K): [in a new window]   Fig. 4. The general concept of pedotransfer functions (PTFs): Utilizing soil survey databases to derive flow and transport characteristics and other model input parameters.

View larger version (47K): [in a new window]   Fig. 5. An illustration of hydropedology functioning as a bridge to connect pedology, soil physics, and hydrology. Three general scales of microscopic, mesoscopic, and macroscopic levels are illustrated in hierarchical frameworks for soil structure (pedology), preferential flow (soil physics), and water quality (hydrology).

View larger version (48K): [in a new window]   Fig. 6. Two conceptual frameworks for multiscale bridging in hydropedology: Hierarchies of (a) soil mapping (for soil distribution) and (b) soil modeling (for soil processes). SSURGO, STATSGO, and NATSGO are county-, state-, and country-level soil maps, respectively. The model scale concept in the right-hand side of the figure is adopted from Hoosbeek and Bryant (1992).

View larger version (32K): [in a new window]   Fig. 7. Five general categories of pedotransfer functions (PTFs) utilizing different types of input data for estimating dynamic soil properties. Landscape features such as digital elevation models (DEM), land use and land cover, and others serve as additional inputs to PTFs, hence connecting the pedon and the landscape scales.

View larger version (69K): [in a new window]   Fig. 8. Contaminant hydrogelogy and hydropedology: As many releases of contaminants to the subsurface occur within or above the vadose zone, hydropedology plays a critical role in the integrated study of contaminant fate in the environment. The left-hand side block diagram is modified from Fetter (1993). The right-hand side photo is modified from Brady and Weil (2000).