Pagar pasir

Gundukan pasir Nakatajima yang berlokasi di selatan kota Hamamatsu. Barikade yang terbuat dari bambu mencegah pasir terbang lebih jauh sehingga melestarikan kawasan pantai berpasir ini
Sebuah struktur bersejarah di Dunedin, Selandia Baru, barisan tonggak kayu yang difungsikan sebagai pemecah angin berpasir

Pagar pasir adalah pemecah pasir merupakan struktur yang serupa dengan pagar salju, yaitu sebuah barikade untuk mengurangi kekuatan angin berpasir sehingga pasir berkumpul di tempat yang dikehendaki dan mencegah pasir terbang lebih jauh ke lokasi yang tidak diinginkan. Pagar pasir digunakan untuk mengendalikan erosi, menstabilkan gumuk pasir, mencegah pasir membanjiri jalan raya, dan mengumpulkan material atau bahan bangunan. Pagar pasir juga digunakan di saat atau setelah peristiwa badai pasir sehingga dapat membantu proses penyelamatan.[1] Pagar pasir juga dapat dibangun untuk menjaga kawasan real estate sebelum kawasan mulai dibangun.[2]

Konstruksi tipikal pagar pasir kecil adalah lembaran plastik dengan banyak berlubang yang dipasang dengan tiang-tiang kayu. Bentuk pagar pasir lainnya yang lebih besar adalah penggunaan lembaran papan kayu atau jalinan kawat sehingga membentuk struktur serupa ventilasi untuk mengurangi kecepatan angin. Pagar pasir yang permanen memiliki tiang yang ditancapkan dalam ke tanah.

Bagaimana pasir dapat mengendap di lokasi yang dikehendaki adalah karena kecepatan angin selalu lebih rendah pada bagian yang dekat dengan permukaan jika dibandingkan dengan angin yang jauh dari permukaan. Dengan memperlambat angin yang dekat dengan permukaan, maka turbulensi akan terjadi, sehingga kecepatan partikulat padat seperti pasir akan menurun dan jatuh.[3] Butiran pasir tidak akan jatuh tepat di atas pagar pasir, melainkan di posisi sebelum dan setelah pagar pasir.[4]

Lihat juga

Referensi

  1. ^ Miller, Deborah L.; Thetford, Mack; Yager, Lisa (2001-01-01). "Evaluation of Sand Fence and Vegetation for Dune Building following Overwash by Hurricane Opal on Santa Rosa Island, Florida". Journal of Coastal Research. 17 (4): 936–948. JSTOR 4300253. 
  2. ^ Nordstrom, Karl F.; Lampe, Reinhard; Vandemark, Lisa M. (2000-01-01). "Reestablishing Naturally Functioning Dunes on Developed Coasts". Environmental Management (dalam bahasa Inggris). 25 (1): 37–51. doi:10.1007/s002679910004. ISSN 0364-152X. PMID 10552101. 
  3. ^ Campbell, E. (March 1975). Snowdrift Structures. Avalanche Protection in Switzerland (pp. 103-116). Fort Collins CO: General Technical Report RM-9, USDA-Forest Service.
  4. ^ How To Install Snow Sand Fence-Guidelines

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