Assessing the Impacts of Vegetable Agroforestry System using SWAT: Nghia Trung Sub-watershed, Vietnam
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1 ssessing the mpacts of egetable groforestry ystem using W: ghia rung ub-watershed, ietnam guyen Kim oi 1, ran hong hat 1, ran e hu Quynh 1, guyen Ha rang 2 ang hanh Ha 1, anuel eyes 3, aghavan rinivasan 4 1 ong am niversity, H, ietnam 2 niversity of ducation and echnical, H, ietnam 3 orth arolina & tate niversity (&), reensboro, 27411, 4 exas & niversity, ollege tation, X 77845, he 5 th W onference on ugust 5-7, 2009, Boulder, olorado
2 8/11/2009 guyen Kim oi 2 ntroduction 1 Watershed escription 2 ethodology 3 esults 4 onclusions 5 2
3 8/11/2009 guyen Kim oi 3 ntroduction part of the irginia ech : groforestry and ustainable egetable roduction in outheast sia Watersheds project oordination: orth arolina & tate niversity esearch team: ong am niversity, Ho hi inh ity
4 ghia rung ub-watershed roblem dentification he rapid increase of population he needs for economic growth and use changes within the watershed merging water problems threaten the livelihood of local people elation of water problem - High growth of population - ocial complex - gricultural activities - and use planning ghia rung ubwatershed 8/11/2009 guyen Kim oi 4
5 bjectives o provide decision makers with a scientific tool for supporting them in making decisions on water and soil resources by delivering appropriate policies about land use allocation, the details of objectives as follows: o apply W model to assess the impact of land use changes and practices in ghia rung ub-watershed on water discharge, and sediment yield to the ng hoai reservoir; o make policy recommendations to policy maker on land use change impact to water discharge, and sediment yield 8/11/2009 guyen Kim oi 5
6 8/11/2009 guyen Kim oi 6 tudy rea
7 8/11/2009 guyen Kim oi 7
8 ata ollection ypes of data recipitation emperature opography oil erosion parameters and se ata and use maps ources of data epartment of and evelopment, Binh huoc rovince Binh huoc eteorological epartment nstitute of Water esource esearch in H epartment of and evelopment, Binh huoc rovince epartment of griculture and ural evelopment, Binh huoc rovince 8/11/2009 guyen Kim oi 8
9 and use types in ghia rung sub-watershed (1) oung ubber (B): he ubber plantation is less than 4 years old. (2) ubber (B): he ubber plantation. (3) rban medium density (settlement) (): he built-up areas consisting of residential and industrial and commercial areas. (4) orest (): he permanent natural forest and reforestation. he main natural forest is vergreen forest (Hill vergreen, ry vergreen) and eciduous forest (ixed eciduous and ipterocarps, eciduous forests) type. (5) Water Body (W): Water bodies (the water bodies are the natural and man-made reservoir). (6) ashew (W): ashew no weeding. (7) ashew (H): ashew has weeding. 8/11/2009 guyen Kim oi 9
10 ethodology cenario : xisting and use W cenario B : groforestry ystem omparisons uggestions on ecision aker cenario : xisting land use combined cashew with weeding and cashew without weeding cenario B1: ll ashew no weeding cenario B2: ll ashew with weeding 8/11/2009 guyen Kim oi 10
11 mage W ata mage lassification oil parameters anduse parameters limate data anduse ap verlay for H definition esults oil ap rcw nterface W ub-watershed delineation W odel for ghia rung ub Watershed, ietnam rainage etwork 8/11/2009 guyen Kim oi 11
12 ghia rung ub-watershed esearched rea Water quality assessment in ghia rung ubwatershed bjectives of research etup nput map tream etwork tream efinition utlet nlet de finition Watershed utlet selection(s) and de finition alculation of ubba sin arameters Water Quality eport of ghia rung ubwatershed 2008 nput Watershed elineator H Write nput table W alibration alida tion nput nput anduse ap oil ap lope Weather tation ainfall emperature pplication of W model for ghia rung sub-watershed 8/11/2009 guyen Kim oi 12
13 8/11/2009 guyen Kim oi 13 ata opo
14 8/11/2009 guyen Kim oi 14 Watershed
15 8/11/2009 guyen Kim oi 15 and use ata
16 8/11/2009 guyen Kim oi 16
17 8/11/2009 guyen Kim oi 17 oil parameters
18 8/11/2009 guyen Kim oi 18 limate data X 1 onghu Buang huocong
19 8/11/2009 guyen Kim oi 19 verlay H
20 8/11/2009 guyen Kim oi 20 et up W
21 8/11/2009 guyen Kim oi 21
22 1. and use change in ghia rung sub-watershed during ashew orest and use types oung ubber ubber rban medium density (settlement) Water body anduse code rea (2007) (ha) % of tota l area rea (2002) (ha) % of total area H B B W otal % % 8/11/2009 guyen Kim oi 22
23 2. he W output for ghia rung sub-watershed using land use map in 2002 and 2007 ear mm Q mm Q mm WQ mm mm ear W mm mm mm W mm on/ha /11/2009 guyen Kim oi 23
24 3. hree landuse scenarios in ghia rung sub-watershed cenario : xisting cenario B1: ashew without weeding and use scenarios for ghia rung sub-watershed cenario B2: ashew with weeding 8/11/2009 guyen Kim oi 24
25 he W output for ghia rung subwatershed with three land use scenarios onth recipitation mm urf Q mm at Q mm ce ce B1 ce B2 ce ce B1 ce B2 ce ce B1 ce B /11/2009 guyen Kim oi 25
26 he W output for ghia rung sub-watershed with three land use scenarios (ont) W mm mm ce ceb1 ce B2 ce ce B1 ce B2 ce on/ha /11/2009 guyen Kim 0.09 oi mm ce B1 ce B2 ce ce B1 ce B
27 8/11/2009 guyen Kim oi 27 omparison W output from three land use scenarios o. arameters nits esult ce ce B1 ce B2 1 recipitation mm urface runoff Q mm roundwater mm otal water mm otal sediment loading on/ha
28 imulation results for xisting land use, ashew with under-story weeding, and ashew without under-story weeding nits xisting and use esults With weeding Without weeding recipitation mm urface runoff Q mm roundwater mm otal water mm otal sediment loading on/ha
29 ashew with weeding ashew no weeding
30 his research is just the first step apply W in ghia rung sub-watershed. he W model performed in simulating the general trend of surface flow, and sediment at sub-watershed over time for daily, monthly time intervals. he results showed that cover change in the cashew under-story affected surface flow, and sediment yield loading to ng hoai reservoir. he cashew was only 27.5 ha or about 3% the research area but without weeding sediment yield was reduced about 0.58 ton/ha and surface flow was reduced about 14 mm. 8/11/2009 guyen Kim oi 30
31 8/11/2009 guyen Kim oi 31 ote here is no observed data in this W simulation. his applies W in a subwatershed in ietnam and was used to compare relative changes in water yield and sediment loss with or without under-story cover in ashew
32 8/11/2009 guyen Kim oi 32 KW he authors acknowledge the funded - groforestry and ustainable egetable roduction in outheast sia Watersheds program for funding this research
33 8/11/2009 guyen Kim oi 33 HK
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