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Water flow paths during the rainy season in an acid sulphate soil

field study in the plain reeds of the Mekong delta, Vietnam

Tri, Vo Khac (1998). Water flow paths during the rainy season in an acid sulphate soil. ["eprint_fieldopt_monograph_type_und_thesis" not defined]. Uppsala: (NL, NJ) > Dept. of Soil Sciences > Div. of Hydrotechnics, Sveriges lantbruksuniversitet. Avdelningsmeddelande / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avdelningen för lantbrukets hydroteknik ; 98:8
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Abstract

Management of acid sulphate soils is one of main problems in the search for sustainable development of the Mekong Delta. This study was carried out within the Management of Acid Sulfate Soil Project (MASSP) at Tan Thanh experimental farm situated in middle of the Plain of Reeds of the Mekong delta, Vietnam, from 1990 until now. The present study concentrated on water flow patterns through the soil profile especially in the rainy season, a time when the chemical and physical processes in acid sulphate soils are very important. With measurements in the field under the two controlling boundary conditions: local weather (upper boundary) and canal water levels (dynamic lower boundary), SOIL model was used as a tool to simulate soil water contents, matric potentials and the distribution of water flow in soils. The results showed an agreement between model simulations and measurements especially in ground water level and soil temperatures. However, simulation of the ground water level became complicated since it was affected by the both high quantity of infiltration and the fluctuation of water flow from canals. The major part of the rain infiltrated and rarely formed soil surface runoff because of high storage capacity and high infiltration capacity. Partitioning between bypass flow and total water flow in the unsaturated part of the profile was estimated at about 50 %, 35 % and 20 % in 10, 20, 30 cm levels respectively. The water exchange between canal water and groundwater was established by the hydraulic gradient of flows (canal levels - ground levels). The ratios of inflow to outflow were about 4.5 from observed data and from simulated data. The reasonable value of the saturated hydraulic conductivity (ks) used in the simulations was in the range of 1.4 - 1.8 cm min-1 for distances to canals in the range of 1 to 5 m.

Authors/Creators:Tri, Vo Khac
Title:Water flow paths during the rainy season in an acid sulphate soil
Subtitle:field study in the plain reeds of the Mekong delta, Vietnam
Series/Journal:Avdelningsmeddelande / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avdelningen för lantbrukets hydroteknik (0282-6569)
Year of publishing :1998
Number:98:8
Number of Pages:40
Place of Publication:Uppsala
Publisher:Institutionen för markvetenskap, avdelningen för lantbrukets hydroteknik
ISSN:0282-6569
Language:English
Publication Type:Report
Refereed:No
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Obsolete subject words > INTERDISCIPLINARY RESEARCH AREAS > Water in nature and society
Keywords:sulphate soil, Vietnam, water flows, rainy season, physical processes, chemical processes
URN:NBN:urn:nbn:se:slu:epsilon-e-3522
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3522
ID Code:4891
Department:(NL, NJ) > Dept. of Soil Sciences > Div. of Hydrotechnics
Deposited By: Elisabeth Bölenius
Deposited On:14 Jul 2010 00:00
Metadata Last Modified:22 Jun 2016 06:29

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