JakartaBicara, Bandung Barat — Warga Kabupaten Bandung Barat, Jawa Barat, dikejutkan dengan kemunculan lubang misterius sedalam 10 meter di area persawahan. Fenomena munculnya lubang tersebut diketahui pada Senin pagi 30 Mei 2022.
Awalnya hal tersebut diketahui warga yang tinggal di Kampung Cigondok, Desa Mandalamukti, Kecamatan Cikalongwetan, yang mendengar suara gemuruh sekitar pukul 04.00 WIB.
Warga pun mencari asal suara gemuruh tersebut, dan diketahui suara gemuruh tersebut berasal dari sebuah fenomena alam sebuah tanah amblas dan membentuk lubang cukup besar. melihat adanya lubang tersebut.
Warga pun berdatangan melihat
lubang misterius tersebut yang diperkirakan berdiameter satu meter dan kedalaman 10 meter.
Meurut Duddy Prabowo, Kepala Pelaksana Badan Penanggulangan Bencana Daerah (BPBD) Kabupaten mengatakan, Warga pada sontak keluar rumah karena penasaran mendengar suara gemuruh dan mencari sumber suara tersebut, yang ternyata berasal dari area persawahan
Sumber gemuruh suara tersebut, ternyata pada area pesawahan, dan terdapat satu titik lubang berdiameter kurang lebih satu meter dengan kedalaman kira-kira 10 meter.
“Dari informasi warga, kejadiannya pada Senin waktu subuh sekira pukul 04.00 WIB. Ini adalah bagian dari fenomena alam yang jarang terjadi,” kata Duddy, Selasa (31/5/2022) kemarin.
Khawatir akan terjadi pergerakan susulan dan lubangnya membesar, warga berinisiatif untuk menguruk lubang misterius tersebut.
“Akhirnya kembali ditutup lagi lubangnya, menggunakan tanah dan material brangkal. Sehingga saat ini lubang tersebut sudah tertutup kembali,” ucap Duddy.
Sementara itu, Kepala Laboratorium Geodesi Institut Teknologi Bandung (ITB) Heri Andreas menjelaskan, lubang misterius seperti yang terjadi di Kampung Cigondok dikenal sebagai sinkhole atau lubang di tanah yang disebabkan oleh erosi dan drainase air, kata heri.
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“Ada tanah yang amblas kemudian dari bentuknya yang bulat itu tipikal sinkhole muncul karena erosi dan drainase air bawah tanah”.
Sinkhole sendiri terbentuk saat lapisan kapur yang berada di bawah tanah dengan kedalaman tertentu, larut oleh air yang meresap dari tanah di permukaan. Kemudian, lapisan kapur itu akan menjadi saluran air bawah tanah atau sungai bawah tanah.
Adapun kapur yang larut oleh air itu kemudian membentuk ruang kosong di bawah tanah. Hal itu disebabkan pada titik itu tidak ada yang menopang sehingga tanah di lapisan atas amblas ke bawah.
“Di daerah Padalarang seperti kita tahu ada lapisan kapur di tanahnya. Jadi, kemungkinannya lubang di Cikalongwetan ini sinkhole tapi ukurannya kecil,” ucap Heri.
“Kalau di beberapa negara yang teknologinya sudah maju, biasanya sinkhole itu diinjeksi lubangnya. Tapi di kita kan rata-rata diuruk dan itu langkah tepat juga,” tambah Heri.
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