Geoscience Reference
In-Depth Information
WATER DEPLETION OF FOUR SOIL LAYERS
IN THE TROPICS
HARIS SYAHBUDDIN
∗,‡,§
and MANABU D. YAMANAKA
∗,†,¶
∗
Graduate School of Science and Technology Kobe University, Japan
†
Institute of Observational Research for Global Change (IORGC)
Japan Agency for Marin-Earth Science and Technology (JAMSTEC), Japan
‡
Indonesia Agro-climate and Hydrology Research Institute (IAHRI), Indonesia
§
haris@ahs.scitec.kobe-u.ac.jp
¶
mdy@kobe-u.ac.jp
Due to the contribution of water from land surface to the atmosphere is pre-
dominant, therefore soil water depletion analysis is necessary. This study was
conducted based on the principle of soil water budget. The soil water depletion
in the day without rain is dominated by water losses upward and opposite in
the day with extreme rain.
1. Introduction
Many scientists consider, the biggest part of water transport to the atmo-
sphere is provided by land surface through an evaporation (
E
)andtranspi-
ration (
Tr
). To study the contribution of water from land surface, we have
to conduct research about the soil water budget at the first place. However,
most of study result about water budget or moisture balance which have
relationship with global climate phenomenon,
1
water and heat flux,
2
water
storage in basing,
3
and crop requirement and water use,
4
,
5
were reported
only for top soil layer or interaction between soil surface and atmospheric
boundary layer (ABL). On the others hand, some studies of water budget
which are consider about soil layer do not include some important factor,
such as characteristic in each a soil horizon and vegetation in land surface
(surface roughness).
6
The propose of this paper is to explore a soil water depletion (SWD)
from four soil layers based on an actual environment of soil horizon char-
acteristic, where saturated soil hydraulic conductivity (
Ks
) and soil depth
is varies for each soil type and layer.
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