摘要:

ABSTRACTThis paper presents, in brief, the research into runoff and soil erosion presently being carried out in the Maphutseng area in Lesotho, Southern Africa. The research has a multilevel approach, i.e. it measures runoff and soil erosion at different scales in the same geographical area. A subcatchment, 5.4 ha in size, is sampled along with 12 runoff plots. The plots are located on three different soil types and have two different agricultural managements. Each trial has two replicas.The results, which are still preliminary, show that 10% of the rainfall ran off and that the soil loss was 16.4 t/ha from the subcatchment. The plots lost on average 0.65 t/ha and there was no significant difference between the two management types.

ISSN:0435-3676    

DOI:10.1080/04353676.1988.11880253

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

ABSTRACTA detailed map of glacial terraces on Mt. Akka and Mt. Kisuris in Lappland, northern Sweden is presented. The Akka terraces consist of a diamicton, which is interpreted to have been deposited by ice and partially reworked by both fluvial and shoreline processes. The Kisuris terraces are composed of glaciofluvial material, which was probably deposited as a series of deltas in local ice-dammed lakes.

ISSN:0435-3676    

DOI:10.1080/04353676.1988.11880254

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

ABSTRACTIn the context of ecosystem modeling, a brief description is given of preliminary results from evaluating the spatial and temporal distribution of conditions favourable for resuspension at the bottom of the Kattegat. Two maps are presented: (1) the water depth at which the wave base is capable of penetrating for a given time-frequency; this is a function of fetch and wind characteristics, (2) the theoretical time-frequency of wave base presence at the bed, primarily a function of the water depth. Here, the influence of fetch is demonstrated in the filtering effect of archipelagos. A division of the Kattegat into four regions with characteristic wave impact climates at the bed was made: the deepest part (NE) is calm because of its water depth; the SamsøBelt (SW) is calm because of limited fetch within the archipelago; a relatively deep area (SE) experiences recurrent resuspension because of long fetch, and the shallowest part (NW) is frequently resuspended despite relatively limited fetch.

ISSN:0435-3676    

DOI:10.1080/04353676.1988.11880255

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor