Studying water budget of paved urban sites using weighable lysimeter

摘要

Permeably paved surfaces make up a considerable percentage of total area in urban areas, especially in older cities. In urban hydrology one important task is keeping rain water in the unsaturated soil zone as long as possible in order to avoid floodsand supply street trees with water. Our lysimeter study addresses a precise analysis of the water balance of two permeably paved surfaces. One surface is covered with concrete pavers and the second one with a so called "Bernburg mosaic of cobble stones".Both are typical for the sidewalks of Berlin. Using this instrumentation, actual evaporation, runoff and drainage can be studied with a high temporal resolution for various climate conditions. A typical runoff coefficient could be gained for a span of typical rainfall intensities. They are essential for developing new urban water management strategies. Furthermore, impact scenarios of expected climate change on urban heat stress and urban hydrology can be predicted.