Korelasi Air Limpasan Dengan Perubahan Sungai Tugurara Sebagai Ancaman Bencana di Kota Ternate Provinsi Maluku Utara

Abstract

Tugurara river is the watershed located at Gamalama volcano that have disaster hazard such as the lahar to the community. Tugurara river located to the North of the city of Ternate, precisely in the district of North Ternate, which was inhabited by people in three village namely, Tubo Village, Akehuda Village and Dufa-Dufa Village. Tugurara river region is an area that geologically consist of young lahar flows that occurred in 1840, 1897 and 1907 with the unconsolidated material. If there is a runoff caused changes of Tugurara river area. This study uses statistical methods i.e. pearson product moment correlation and significant test of product moment correlation. results revealed that runoff water correlate with extensive changes of Tugurara river area. Extensive changes of Tugurara river area becomes greater because the amount of runoff water discharge erode the rock on the river wall and causing lanslide the river wall as well as presenting any material river wall along the river as a catastrophic outburst flood lava on a residential area in three villages in 2011. Therefore changes Tugurara river area, occurred very significant. The results of the coefficient of product moment correlation test is known that the correlation is very strong for 0.994 and significantly their values count r (rh> rt) r tables for 0.950, so Ha is received and the value of the coefficient can be imposed on a population sample is taken.