A New Method In Determining Bulk Hydraulic
Conductivity Of Mangrove Forest Sediment
Author(s)
A. Susilo
Abstract
The flow of groundwater from mangrove swamp sediment to mangrove creeks is
likely to be an important pathway in mangrove swamps, particularly for the
removal of salt excluded at the mangrove root. The swamps are generally
saturated with water, and are perforated with animal burrows, allowing a
significant groundwater flow to mangrove creeks to occur. The hydraulic
conductivity of the sediment is thus an important physical parameter but is very
difficult to measure in-situ. This paper describe a simple method for determining
the hydraulic conductivity of mangrove sediment, including the effect of
macropores such as crab burrows, that use the existing animal burrows as
piezometers. Experiments to measure the hydraulic conductivity of the sediment
were carried out in a variety of mangrove forests. It was found that hydraulic
conductivity varied from around 1 m/day–10 m/day, which is at least 10 times
greater than would be expected if there were no burrows. In order to check the
validity of this method, conventional piezometers were used to determine the
free water table level in an area of mangroves fringing a creek. The hydraulic
conductivity determined from these experiments was found to be consistent with
the new methodology.
Keywords: hydraulic conductivity, mangroves, burrow, piezometer.
1 Introduction
The salinity of the groundwater has a significant influence on the growth of
mangrove trees. Mangroves that grow in areas that are frequently inundated by
the tide, or that grow in lower salinity regions of the estuary, are likely to grow
more rapidly than those living in regions where the swamp is rarely inundated,
and where groundwater salinity is very high [1].
Keywords
hydraulic conductivity, mangroves, burrow, piezometer.
Related Book
Other papers in this volume
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