CAJ | 학술논문

降雨-滑坡关系是对降雨引发的滑坡进行预报的一个重要基础.本文根据中国浙江省1990～2003年期间有明确日期和坐标记录的1414个滑坡数据和基本覆盖浙江全部陆地区域的1257个雨量站记录的日降雨量数据,研究了滑坡频度-降雨关系.研究结果表明,降雨引发滑坡的频度与降雨量之间遵循分形的幂指教关系,并且在两个尺度的降雨量范围内具有不同的标度指数.按照幂指数关系拟合的两条滑坡累计频度-降雨关系线交点(拐点)处的降雨量(R_(in))指出了引发75%左右滑坡的累计降雨阀值的上边界(以TH_(CR)表示).对1d、4d、6d和11d这4个累计降雨时段的研究表明,引发75%左右滑坡的累计降雨阀值分别为205mm(1d)、273mm(4d)、294 mm(6d)、315 mm(11d).
강우-활파관계시대강우인발적활파진행예보적일개중요기출.본문근거중국절강성1990～2003년기간유명학일기화좌표기록적1414개활파수거화기본복개절강전부륙지구역적1257개우량참기록적일강우량수거,연구료활파빈도-강우관계.연구결과표명,강우인발활파적빈도여강우량지간준순분형적멱지교관계,병차재량개척도적강우량범위내구유불동적표도지수.안조멱지수관계의합적량조활파루계빈도-강우관계선교점(괴점)처적강우량(R_(in))지출료인발75%좌우활파적루계강우벌치적상변계(이TH_(CR)표시).대1d、4d、6d화11d저4개루계강우시단적연구표명,인발75%좌우활파적루계강우벌치분별위205mm(1d)、273mm(4d)、294 mm(6d)、315 mm(11d).
This paper studied the relationship between the landslide occurrences and the rainfall level based on 1414landslides from field survey and daily rainfall data corresponding to the date of the landslide occurrence during 19902003 in Zhejiang Province,China.The results showed that the cumulative frequency of the landslide occurrence correlates well with the landslide-triggering rainfall and can be described using two power-law relations with different scaling exponents for two different ranges of the rainfall level.The rainfall level corresponding to the intersection point of two fitted correlation lines may be defined as the cumulative rainfall threshold(TH_(CR))that defines the upper-bound rainfall thresholds for triggering shallow landslides;a large number of landslides may be induced when the amount of cumulative rainfall comes to the TH_(CR) value.For the cumulative rainfall in four time intervals considered(1,4,6 and11 days),the TH_(CR) for triggering about 75%of landslides in the study region is 205mm for 1 day,273mm for 4 days,294 mm for 6 days,and 315 mm for 11 days,respectively.