The  S110rtagP  Of  WatPT  TPSOLITCPS  1S  a  SPTIOLIS  pT Oh1Pm  partlCLIlaTly  In  f.hlna.  Nlanaglng  WatPT  TPSOLITCPS  On  the  haS1S  Of
PVapOtTanSplTatlOn(ET},  TPtT1PVPd  malnly  from  SatPlhtP  TPmOtP  SPriSlng,  1S  a  nPW  COriCPpt  1ntT0(1LICPd  In  the  CEF  Hal  hTO}PCt  On COmpTP11PriS1VP management Of  WatPT TPSOLnCPS and PriV1TOnmPnt. rfhP mOSt pOpLIlaT TPmOtP  SPriSlng afgOTlthmS In the TPtT1PVa1 Of ET aTP TPV1PWPd.  Among  them  the  SEBAL     }SLII}}aCP  EriPTgy  BalanCP  A1gOTlthm  fOT  Lan(1}  haS  hPttPr  phySlCa1  haC1}gTOlln(1  and  Keen  LISPd OpPTatlOnally In many COLIntT1PS In last  IO yPaTS.  Data from the  NIOI}PTatP TPSOhltlOn Imaglng  CtTOTadlOmPtPT     }NIOI}IS}  and LandSat  TNI} ErfNI+  have  Keen  LISPd  t0  PVa1LIatP  (lady,  SPa.SOnal  and  annllaf  ET pPT  COllnty  and  pPT  land  LISP  Category.  A  pTPhmlnary  analySlS for the Hai Basin, for 2002, is presented. Further studies will he continued for the Hai River Basin over next five years, which will pTOV1dP  a TPfPTPriCP  fOT the  apphCatlOn  Of  haSln  SCa1P  Water LISP  tPChnOlOg1PS,  In  partlCLIlaT,  the  real  Sa.Vlng  Of  Water  TPSOLITCPS  by  the reduction of ET. In the understanding of the limits of SEBAL, an independent validation program, including precise in situ flux OhSPrVatlOriS,  1S  t0  he  OpPTatPd  In  the  Hal  Ba.Sln  hrO}PCt.  FOT  demnnStratlnn  pPT10(1S,  WP  have  tT1Pd  t0  LISP  n1PSOSCa.}P  atmOSphPT1C m0(1P1S,  SLICK  aS  MMS,  t0  get the  mPtPOTOlOglCaf  f1P1dS  nPa.T  SLII}}aCP,  arid  help  SEBAL  In  1tS  CalClllatlOn  Of  SLII}}aCP  f1LIXPS.  The  Ina}Or taSl} 1S the PStahhShmPnt Of a real  Water Sa.Vlng pTOgTam thTOllgh an ET TP(1LICtlOn  Strategy,  Wlth mOTP  Water TPSOLITCPS TPmalnlng In the haSln  fOT  pT0(1LICtlOn  and  PriV1TOnmPntal  LISP,  1nCllldlng  mOTP  fTPS11WatPT  d1SChaTgPS  lnt0  the  BOhal  Sea.  ET  TP(1LICtlOn  1S  land  LISP  arid CTOp type dependent. Other management faPtnrS  afSO need t0 he 1nCh1(1Pd.

Dealing with the regional land surface heat fluxes over heterogeneous landscape of desertification area near sea is very important and not an easy problem. In this study,a parameterization method based on Landsat-7 ETM+data and field observations is described and tested for deriving the regional land surface variables, vegetation variables and land surface heat fluxes over heterogeneous landscape.As case study, the method is applied to Jiddah area of Saudi Arabia. The regional distributions of surface reflectance,NDVI, MSAVI,vegetation coverage,LAI,surface temperature, net radiation, soil heat flux, sensible heat flux and  latent heat flux have been determined over Jiddah area. The derived results have been validated by using the“ground truth”. The
resultsshow that the more reasonable regional distributions of land surface variables (surface reflectance, surface temperature), vegetation variables (MSAVIand vegetation coverage), net radiation, soil heat flux and sensible heat flux can be obtained by using the method proposed in this study. Further improvement of the method is also discussed.

The progress and difficulties on the stu即of regional land surface heat fluxes over heterogeneous landscape by using Landsat TM and NOAA/ AV HRR data were introduced in this stu街.The solving way of the difficulties was also proposed.