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NTIS 바로가기Journal of Korea Water Resources Association = 한국수자원학회논문집, v.47 no.2, 2014년, pp.119 - 133
The study adopted extended Kalman filter technique in an effort to predict Z-R relationship parameter as a stable value in real-time. Toward this end, a parameter estimation model was established based on extended Kalman filter in consideration of non-linearity of Z-R relationship. A state-space mod...
핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
수문분야에서 레이더 강우는 어디에 이용되고 있나? | 고해상도(high resolution)의 연속형 자료인 레이더 강우의 활용이 가능하였기 때문이다(Legates, 2000). 수문분야에서 레이더 강우는 주로 홍수범람 및 돌발홍수 예측을 목적으로 분포형 강우-유출 모형의 입력자료로 이용되고 있다. 이러한 레이더 강우는 지상우량 계로 관측된 강우보다 정량적 정확도는 상대적으로 떨어지나 광범위한 강우의 공간분포를 연속적으로 고려할 수 있다. | |
레이더 강우는 어떻게 추정되나? | 레이더 강우는 기상레이더로부터 송신된 전자파가 강수입자에 반사되어 되돌아온 신호세기인 반사도(reflectivity, Z)로부터 추정된다. 강수입자에 대한 반사도는 지상강우강도(ground rain rate, R)와의 관계를 일련의 멱함수(power function)로 표현한 Z-R 관계식(Z=ARb, 식에서 매개변수 A는 상수항, b는 지수항)을 이용하여 강우강도로 변환된다. | |
정량적 강수량 추정에서 중요한 것은 무엇인가? | QPE 과정에서 무엇보다 중요한 것은 Z-R 관계식의 매개변수 추정이다(Krajewski and Smith, 2002). 이와 관련된 연구는 1900년대 중반부터 시작되었으며, 처음에는 강수의 입자직경분포(Drop Size Distribution, DSD)로부터 매개 변수를 추정하였다(Marshall and Palmer, 1948; Twomey, 1952; Blanchard, 1953; Jones, 1956; Battan, 1973). |
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