Manfred Seyfarth

Advanced Technologies in Lysimetry

The ability to quantify soil water flow is a prerequisite for the accurate prediction of solute transfer within the unsaturated zone. Monitoring these fluxes is a challenge because the results are required for answering not only scientific but also practical questions regarding the protection of groundwater, the sustainable management of agricultural, forestry, mining or set aside industrial areas, the reduction of leachate loss from landfills, and for explaining the fate of environmentally harmful substances. Both direct and indirect methods exist for estimating water flux rates; these have been applied with varying success. In Europe, the use of direct lysimetry methods for measuring water and solute fluxes in soils has increased significantly in recent years. Although this technique generates reliable drainage data, it involves relatively high investment and maintenance costs. New lysimeter techniques have been developed to tackle this problem. It is now possible to collect large monolithic soil columns and to measure the soil water balance of these monoliths (surface area 0.03–2 m2 and depth to 3 m) with a high degree of precision (±20 g). Furthermore, progress in lysimetry enables us to ascertain experimentally the mass input of dew and to calculate actual evapotranspiration, precipitation and seepage rates. Weighable groundwater lysimeters have been developed in addition to gravitation lysimeters. Different lysimeter types and their usage will be presented and explained using practical examples.

Soil hydrological monitoring in the framework of the remediation and long-term safeguard of uranium ore mining residues of the Wismut GmbH

This article provides an insight into the extent of remediation of residues of the uranium mining of the Wismut GmbH. Using the example of the waste rock dump Beerwalde in the Ronneburg region the layout of the measurement systems and the measurement technology used will be described. The results of the long-term measurements show the importance of this measurement campaigns for this remediation project in particular, and future remediation projects in general.