Analysis of Spatial Variability for Infiltration Rate of Field Soils II. Kriging

토양중(土壤中) 물의 침투속도(浸透速度)의 공간변이성(空間變異性) 분석(分析) II. Kriging

Spatial variability of 96 laboratory-measured infiltration rates on the Hwadong SiCL was studied using geostatistical concepts. The measurement was made at the nodes of the regular grid consisting of 12 rows and 8 columns. Sample spacing within rows and columns was 3 and 2m, respectively. Kriging was a means of spacial prediction that can be used for the infiltration rate. It was optimal in the sense that it provided estimates at unrecorded places without bias and with minimum and known variance. An attempt has been made with original data to verily the validity of all assumptions (Stationarity, Variogram models, etc.) by Jack-knifing procedure and frequency distribution. Variogram models were not different from other models, such as linear in calculation of both kriged values and variances in justification of its choice for simplicity. Correlation coefficient for a one-to-one relationship between measured and kriged values was found to be 0.308, which was not significantly different at 1% significance level.

화동미사질식양토(華東微砂質埴壤土)의 침투속도(浸透速度)에 대한 공간변이성(空間變異性)이 지질통계학적(地質統計學的) 개념(槪念)인 지역변수이론(地域變數理論)으로 기술(記述)하였고, 구조분석(構造分析)에서 얻어진 정보(情報)를 이용(利用)하여 최양선형불편추정치(最量線型不偏推定値)(BLUE)인 Kriging값을 계산(計算)하였는 바 그 결과(結果)는 다음과 같다. 1. 최소(最少)의 분산(分散)으로 Kriging같이 추정(推定)되었다. 2. 설정(設定)된 선형(線型)의 평균(平均) Variogram은 Kriging값을 추정(推定)하는 데 적합(適合)하다고 판단(判斷)되었다. 3. 표본추출지점(標本抽出地點)에서의 Kriging값과 실관측치(實觀測値)의 상관(相關)은 고도(高度)의 유의성(有意性)을 나타내었다.