Journal of the Korean Geographical Society (대한지리학회지)

The Korean Geographical Society (대한지리학회)
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Influences of Physical Soil Properties on Drought Severity in the Central Great Plains Based on Satellite Data and a Digital Soil Database

인공위성자료와 디지털 토양자료를 통해 분석한 미중부 대평원 지역 가뭄정도에 미친 물리적 토양특성의 영향

  • Sunyurp Park (Kansas Applied Remote Sensing Program, University of Kansas)
  • Published : 2003.12.01
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Abstract

The State Soil Geographic (STATSGO) database is a valuable source for assessment of soil properties at a state level. Using GIS techniques, eight physical soil properties were extracted from the database, including available water capacity, clay content, soil depth, slope, depth to water table, drainage, texture, and permeability. The influences of these soil properties on drought severity, which was estimated by NDVI departures from normal, were determined over western-central Kansas. Study results showed that seven soil properties had significant relationships with drought severity with correlation coefficients, ranging from -0.89 to 0.85. Thermal emission signals from the Moderate Resolution Imaging Spectroradiometer (MODIS) had a significant relationship with drought severity expressed by NDVI departure from normal and represented spatial progression of drought over time well. High thermal signals, indicating high soil moisture deficit, emerged in the western region and their spatial distribution changed over time. Different sets of soil factors influenced drought severity among early-drying and late-drying areas.

STATSGO 데이터베이스는 주단위의 토양 특성을 분석하는 데에 있어 효과적인 자료다. 본 연구에서는 GIS 기법을 이용하여 STATSGO로부터 8개 주요 토양 특성을 추출하였다: 함수력(available water capacity), 점토비율, 토양깊이, 사면경사. 지하수위까지의 깊이, 배수 특성, 토성, 투수도, 평균적인 NDVI로부터의 편차로 정의된 가뭄 정도(drought severity)에 대해 앞서 열거한 토양 특성이 미치는 영향을 캔자스 중서부 지역을 대상으로 분석하였다. 연구 결과에 따르면, 분석된 8개 변수 중 7개가 통계적으로 유의한 상관관계를 가진 것으로 나타났는데, 상관계수는 -0.89에서 0.85에 이르렀다. Moderate Resolution Imaging Spectroradiometer(MODIS)로부터 취득된 지표복사열(thermal emission) 자료는 평균 NDVI에 대한 편차로 표현되는 가뭄정도와 통계적으로 유의한 상관관계를 가졌으며, 식물생육기간에 걸친 가뭄지역의 공간적 변화를 잘 나타내었다. 토양수분의 결핍양이 많아질수록, 복사열 시그널 값도 높아지며, 공간적 분포로 볼 때. 상대적으로 건조한 캔자스 서부로부터 증가하여 시간에 따라 점차 그 분포도 변화하였다. 연구결과는 또한 가뭄의 진행단계에 따라 가뭄에 대한 각 토양 변수의 영향도 달라짐을 보여주었다.

Keywords

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