Channel Adjustments and Planform Changes - Part of the Upper Linggi River System
Abstract
The present study examines structural changes (planform) for part of the upper reaches of Batu Hampar river, a main tributary of Linggi river in the state of Negeri Sembilan. The area represents fluvial environments typical of steep headwaters grading into meandering river channels. Two main groups of thresholds associated with rainfall fluctuations and landuse changes for the period 1966 to 1993 were distinguished. The study relates these thresholds to a channel planform interpretation of aerial photographs for 1966, 1982 and 1993. Channel planform changes for the period mentioned were interpreted based on the overall channel form and at selected meander bends. Both the effects of rainfall fluctuations and landuse changes upstream on downstream loops are thought to influence changes in channel alignment and bend characteristics of the Batu Hampar river. The mechanics of channel processes, however, were not measured under the present study and this limits a good understanding of the full range of channel planform changes at a reach in space and time.
ABSTRAK
Kajian ini meneliti perubahan kestrukturan (bentuk pelan) sebahagian daripada hulu Sungai Batu Hampar, sebatang anak sungai utama Sungai Linggi di Negeri Sembilan. Kawasan ini mewakili persekitaran dataran sungai yang biasa dengan bahagian puncak yang curam bertukar kepada alur sungai berliku. Dua kumpulan utama ambang berkaitan turun naik curahan hujan dan perubahan guna tanah antara 1966 dan 1993 telah dapat dikenalpasti. Kajian ini mengaitkan ambang- ambang tersebut kepada interpretasi bentuk pelan alur dari foto udara tahun-tahun 1966, 1982 dan 1993. Perubahan bentuk pelan alur untuk tempoh tersebut diinterpretasikan berdasarkan bentuk alur keseluruhan dan pada likuan meander terpilih. Kedua-dua akibat turun naik curahan hujan dan perubahan guna tanah ke hulu atau ke hilir likuan dijangka mempengaruhi perubahan pada keseluruhan alur dan ciri-ciri liku Sungai Batu Hampar. Bagaimanapun, mekanik proses alur tidak diukur di dalam kajian ini dan dengan itu menghadkan pemahaman tentang pencapaian perubahan keseluruhan bentuk pelan alur dari segi masa dan ruang.
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