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Estimation of Water Balance based on Satelite Date in the Korean Peninsula
Shin, Sha-Chul,Sawamoto masaki, Sawamoto-Masaki Korea Water Resources Association 1997 Korean journal of hydrosciences Vol.8 No.-
Quantifying water balance components is crucial to understanding the basic hydrology and hydrochemistry. An importance of water balace studies has been emphasized from the need to grasp the actual condition of water resources and environmental changes including climatic changes. This paper proposes a method for evaluating water balance components based on the vegetation monitor using remote sensing data. Here, the evapotranspiration model adopts a direct method by using NDVI(Normalized Difference Vegetation Index) calculated from NOAA/AVHRR data and a detailed descriptionof water balance by using the evapotranspiration over the Korean Peninsula. In the study, areal distribution data sets of water balance components are produced using NDVI and a simplified water balance model. This method enables one to discuss the hydrological problems for North Korea where insufficient meteorological and hydrological data exist. The results obtained indicate the specific regional features on water inventory and fluctuation in water balance.
ANALYSIS OF SEA SURFACE TEMPERATURE VARIABILITY IN THE COASTAL AREA OF THE NORTHEAST JAPAN
Chan Su Yang,Hitoshi Tanaka,Masaki Sawamoto,Kimio Hanawa 한국해안해양공학회 1999 학술강연회 발표논문초록집 Vol.1 No.1
Thirty-seven AVHRR images taken in the month of May from 1990 to 1994 are used to examine the sea surface temperature (SST) variability in the coastal area of the Northeast Japan. Empirical orthogonal function (EOF) analysis is adopted to study a time-series of IR images from the Sendai Bay region, to determine the dominant patterns of sea surface temperature (SST) variance in May. EOF analysis decomposed the time series into its component parts. Monthly-mean 5 images in each year are also used to make a comparison with the results of daily-image analysis. EOFs of the temporal and spatial SST variance for two kinds of image show that the dominant SST pattern is generated by spatially varying offshore water mass in the presence of the Kuroshio/Oyashio current, accounting for 95.7% (from monthly-averaged images) of the total variance. Higher modes in this area are interpreted as the result of heating and cooling of bay waters due to the interaction of offshore waters.
신사철,택본정수,김치홍,Shin, Sha-Chul,Sawamoto, Masaki,Kim, Chi-Hong 한국수자원학회 1995 물과 미래(한국수자원학회지) Vol.28 No.1
본 연구의 목적은 NOAA-AVHRR data 를 이용하여 광역 지표면에서의 증발산량과 그 공간적인 분포를 추정하는 것이다. 증발산을 지배하는 많은 인자들은 그 점의 식생조건에 의해 잘 반영된다고 생각할 수 있으며, 그점의 식생의 량과 활성도를 정량적으로 표현할 수 있는 지표로서 NDVI(Normalized Difference Vegetation Index)를 NOAA data로부터 구한다. 본 연구에서는 이 NDVI의 계절변화로부터 한반도의 개략적인 피복상황을 분류하고, NDVI의 histogram과 증발산량과의 상관관계로부터 한강유역에 있어서의 증발산량과 그의 공간분포를 구하였다. The purpose of this study is to estimate evapotranspiration and its spatial distribution using NOAA-AVHRR data. Evapotranspiration phenomena are exceedingly complex. But, factors which control evapotranspiration can be considered that these are reflected by conditions of the vegetation. To evaluate the vegetation condition as a fixed quantity, the NDVI(Normalized Difference Vegetation Index) calculated from NOAA data is utilized. In this study, land cover classification of the Korean peninsula using property of NDVI is performed. Also, from the relationship between evapotranspiration and NDVI histograms, evapotranspiration and its distribution of the Han River basin are estimated.