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Factors Controlling Sediment and Phosphorus Export from Two Belgian Agricultural Catchments

^a Lab. for Experimental Geomorphology, K.U. Leuven, Redingenstraat 16, 3000 Leuven, Belgium
^b Lab. for Soil Fertility and Soil Biology, K.U. Leuven, Kardinaal Mercierlaan 92, 3001 Heverlee, Belgium

View larger version (61K): [in a new window]   Fig. 1. Contour maps of the Kinderveld and Ganspoel catchments indicating the road system, drainage area, and brooklet in which the San Dimas flumes were installed (contour interval = 5 m). The thalwegs as mentioned in Table 6 are also indicated (TW1–4).

View larger version (29K): [in a new window]   Fig. 2. Histogram of slope distributions in the Kinderveld and Ganspoel catchments.

View larger version (15K): [in a new window]   Fig. 3. Relationship between total phosphorus (TP) of the suspended sediments and organic carbon content (OrgC).

View larger version (23K): [in a new window]   Fig. 4. Relationship between total phosphorus and particulate phosphorus (P) and suspended sediment concentration (SSC) from this study and from studies reported in the literature.

View larger version (41K): [in a new window]   Fig. 5. Valley-floor sediment deposition downslope of eroded areas in the Ganspoel catchment after the event of 6 June 1998 (as measured by a global positioning system [GPS]). The map shows the lowest area of the catchment south of the brooklet (contour interval = 5 m).

View larger version (30K): [in a new window]   Fig. 6. Histogram of vegetation cover distributions in the Kinderveld catchment during the winter periods of 1996–1997 and 1997–1998 (for each year measured in the month of February).