The generation and redistribution of overland flow on a massive oxic soil in a eucalypt woodland within the semi‐arid tropics of North Australia
作者:
Mike Bonell,
John Williams,
期刊:
Hydrological Processes
(WILEY Available online 1986)
卷期:
Volume 1,
issue 1
页码: 31-46
ISSN:0885-6087
年代: 1986
DOI:10.1002/hyp.3360010105
出版商: John Wiley&Sons, Ltd
关键词: Eucalypt woodland;Semi‐arid tropics;Massive oxic soils;Method of measuring overland flow;Time to runoff;Overland flow;Infiltration
数据来源: WILEY
摘要:
AbstractThere is a dearth of knowledge on the runoff processes of eucalypt woodland communities in the semi‐arid tropics of Australia. The work was undertaken on a 100 m transect of a 0·8 degree hillslope typical of the ‘smooth plainlands’ of central‐north Queensland. This paper introduces a new experimental design for measuring overland flow in such areas by way of a cascade system of unbounded runoff plots which allow the inputs and outputs between troughs to be calculated. Most storms generate overland flow. Time to overland flow ranges between 1 and 18 min where rain intensities are above 10mm hr−1and when the average detention storage of 3·6 mm is exceeded. The bare soil surfaces within the scattered grass understory control the runoff generation process through the temporal variability of field saturated hydraulic conductivity. The study demonstrated that overland flow is mainly redistributed over the freely‐draining oxic soil. Some areas export more overland flow than they gain from upslope (runoff), others gain more overland flow than they export (runon). Over the study period only 2 per cent of total rain is transferred out of this 100 m transect as overland flow due to the short duration of storms, the relatively high soil permeability, and the low slope angle. The remainder adds to the large soil water store or deep drainage. The variability of runoff–runon over these ‘smooth plainlands’ highlights how results from bounded plots would be misle
点击下载:
PDF
(1097KB)
返 回