APLIKASI SISTEM INFORMASI GEOGRAFIS UNTUK MENDETEKSI POTENSI BANCANA TANAH LONGSOR DAN BANJIR BANDANG

Tanah longsor adalah suatu pergerakan masa tanah pada bidang kelerengan dari elevasi tinggi rendah dalam suatu waktu. Sedangkan Banjir bandang adalah suatu kondisi luapan air sungai yang disertai material hanyutan dalam volume yang sangat besar dan dalam kecepatan tinggi.

Informasi Lokasi

Salah satu kabupaten baru di propinsi Sulawesi Tengah wilayah Kabupaten Morowali yaitu Kabupaten Tojo Una-uni. Wilayah ini dialiri sungai yang beraliran desar. Saat musim hujan debitnya tinggi dan keruh sedangkan pada musim kemarau debitnya kecil dan jernih. Sungai-sungai besar dikabupaten ini memiliki catatan sejarah panjang sebagai sungai pembawa bencana banjir bandang yang terjadi setiap hujannya khususnya Sungai Podi.

Metode penelitian

Investigasi Topografi

Untuk metode investigasi topografi, cara yang dilakukan adalah dengan melakukan pemetaan melalui citra satelit.

Investigasi Vegetasi dan Geomorfologi disekitar DAS

Investigasi lapangan, dilakukan dengan cara survei jalan dan interview pada masyarakat sekitar daerah terdampak. Target yang diamati adalah vegetasi, struktur geologi tanah dan batuan, pengamatan debit sungai normal dan banjir, material hanyutan. Awal survei dilakukan dari bagian hilir hingga kearah hulu sejauh sekitar 5 km.

Teknologi penginderaan jauh sangat membantu dalam proses pendeteksi dini kemungkinan jauh sangat membantu dalam proses pendeteksian dini kemungkinan terjadinya bencana alam, khususnya tanah longsor. Akurasi dari teknologi informasi penginderaan jauh ini masih harus dievaluasi dengan kegiatan lapangan yang bertujuan untuk mencocokan infirmasi yang ada dengan kenyataan dilapanhan. Potensi bencana banjir bandang masih akan terjadi bahkan mungkin akan lebih besar lagi sehingga perlu dilakukan tindakan untuk menghindari atau meminimmalkan kerugian yang dapat terjadi

 

Sumber : Eri Andrian Yudianto, APLIKASI SISTEM INFORMASI GEOGRAFIS UNTUK MENDETEKSI POTENSI BANCANA TANAH LONGSOR DAN BANJIR BANDANG

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