03703nas a2200277 a 450000500170000000800410001703500150005810000180007324501110009126000670020230000550026949000270032450001420035150200590049352023960055265000510294865000530299970000350305270000480308770000450313570000450318071000390322571000360326481000590330085600660335920260817172837.0180809s2017    th uu m rtt   0|  a1eng d  a.b122052541 aBhatta, Binod10aClimate and land use change impacts on streamflow and water quality in the Songkhram River Basin, Thailand  aPathum Thani, Thailand :bAsian Institute of Technology,c2017  a1 online resource (115 leaves) :bill. (some col.)1 aThesis ;vno. WM-17-15  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Water Engineering and Management  aThesis (M. Eng.) - Asian Institute of Technology, 2017  aThis study examined the combined and separated impacts of climate and land use change on streamflow,  sediment  yield  and  nitrate-nitrogen  in  Songkhram  river  basin  Thailand.  The climate data predicted by ACCESS, CNRM and MPI for three future time periods (2010{u2013}2039, 2040{u2013}2069, 2070{u2013}2099) were prepared by using linear scaling bias correction method under RCP 4.5 and RCP 8.5. Three calibrated RCM showed that temperature is continuously increasing in the study area, however, future precipitation is highly complex and uncertain, there were  significant  differences  among  various  RCM  under  RCP  scenario.    The  future land use were simulated using the Conservation of Land Use and its Effects at small regional extent  (Dyna-CLUE)  model  by  establishing  logistic  regression  model  for  seven  land use types. The  regression  model  Load  Estimator  (LOADEST)  were  applied  to  developed  regression equations  and  to  estimate  nutrient  and  sediment  loading  at  three  site  of  Songkhram  River basin from 1990 to 2014. Estimated loading shows increasing trend during past, however, suspended  solid  showed  decreasing  trend  during  historical  period.  Non-parametric  Mann-Kendall test was used to check the significance of trend. Three scenarios (climate change only, land use change only and combined) were developed and the streamflow, sediment yield, and nitrate yield in future periods under these scenarios was simulated by using Soil and Water Assessment Tools (SWAT) model. Under climate change  only  annual  and  seasonal,  streamflow,  sediment  yield,  and  nitrate  yield  is  in decreasing rate with more in later period. Whereas land use change increase the flows and sediment  yield  during  all  periods  and  under  both  scenarios.  But  LULC  change  decreased nitrate  yield.  The  results  for  combined  scenario  was  similar  to  that  of  the  climate  change only scenario. In  the  future,  climate  changes  tend  to  affect  the  hydrological  regimes,  sediment  yield  and nitrate yield much more prominently than the land use change, leading significant decreasing in  streamflow,  sediment  yield  and  nitrate  yield.  Nevertheless,  the  role  of  land  use  change should not be overlooked, especially if the climate becomes drier in future, as in this case it may magnify the hydrological responses. 0aWater qualityzThailandzSongkhram River Basin 0aClimatic changezThailandzSongkhram River Basin1 aShrestha, Sangam,eChairperson1 aBabel, Mukand Singh,eExamination Committee0 aDuc Hoang Nguyen,eExamination committee1 aBhattarai, Rabin,eExamination Committee2 aAIT Fellowship,eScholarship Donor2 aWEM Project,eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. WM-17-15  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B04455