This paper is a preliminary study to get the correlation equation between discharge rate and meandering river geometry of Brantas River meander of Ngadiluwih Kediri. The correlation equation was derived based on the results of earlier studies that be compared with the river geometry from measurement. As reverences, there are two main equations, it have been introduced that are = Kata kunci: debit, geometri, meander, dan sungai.
PendahuluanPergeseran alur sungai adalah suatu proses di dalam sungai yang berkaitan dengan erosi pada satu tebing dan dasar sungai di satu sisi disertai dengan pendangkalan di sisi lain. Fluktuasi debit yang terjadi sepanjang tahun menyebabkan perubahan tanah dasar dan tebing sungai, perubahan fluktuasi debit kemungkinan juga akan menyebabkan cepatnya pergerakan alur sungai. Kondisi alam membentuk aliran sungai dengan geometri sesuai dengan tuntutan debit yang terjadi dan topografi yang ada sehingga menjadikan sungai tidak mungkin terlihat lurus sempurna. Ketidaklurusan sungai ini menyebabkan terjadinya arus helik (helical flow) (Chow, 1959) yang mempercepat terjadinya belokan-belokan dan lengkungan-lengkungan sungai. Pada alur sungai bermeander ini ancaman keamanan bangunan persungaian menjadi lebih nyata, hal ini terlihat bahwa pergerakan alur sungai bermeander lebih
Analysis of a rain and season pattern becomes very important to avoid water supply deficit at the region with limited water resources. This study aims to quantify the rain and season pattern of region, East Java. The result shows, average rainfall precipitation is 1,4 mm/minutes at the 0 to 5 minutes of rain, 1,6 mm/minutes at the 5 to 10 minutes of rain, 1,5 mm/minutes at 10 to 20 minutes of rain, 0,13 mm/minutes at the 20 to 57 minutes of rain, and 0,12 mm/minutes at the 57 to 81 minutes of rain. Moreover, pattern of the season shows that the beginning of dry season is in March, the peak of dry season is in June, the first rainfall is in the middle of September, and the peak of rain season in January.
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