Beam-Type Sabo Dam Performance in Trapping Woody Debris and Boulders in Debris Flows

EasyChair Preprint 14887

Abstract

The aftermath of the March 26, 2004 landslide that occurred within the upper Jeneberang River led to the accumulation of 300,000,000 m3 of caldera wall debris material. According to the South Sulawesi Pompengan River Basin Center (BBWS), approximately 80,000,000 m3 of this material had entered the Bili-Bili reservoir by 2019. The hydrometeorological disaster on January 22, 2019 was caused by heavy rainfall of 300 mm/day, leading to a debris flow carrying boulders and wood debris. The investigation revealed that the sand pocket, originally designed to hold sediment of sand grains, has now surpassed its capacity due to the influx of boulders. Sabo dams constructed upstream have struggled to contain significant quantities of boulders, resulting in some of them being carried downstream as debris towards other structures. Not only have some sabo dams reached their maximum capacity, but several have also sustained damage from boulders measuring 1-2 meters in diameter. One potential solution to prevent the flow of boulders and wood debris downstream is the construction of beam sabo dams. These structures are designed to effectively retain such debris, thereby safeguarding the structures located further downstream. In order to assess the effectiveness of beam sabo dams in capturing a combination of boulders and wood debris, a comprehensive study is essential. This research aims to identify the debris flow parameters that influence the performance of beam sabo dams, establish the interrelationships between these parameters, and determine the optimal gap distance between beams to effectively trap debris flow carrying boulders and wood debris. The proposed research methodology will involve experiments with a physical model in a laboratory setting by utilizing a flume.

Keyphrases: Sabo Dam, debris flow, sediment transport, woody debris

@booklet{EasyChair:14887,
  author    = {Andi Bunga Tongeng and Rita Tahir Lopa and Farouk Maricar and Bambang Bakri},
  title     = {Beam-Type Sabo Dam Performance in Trapping Woody Debris and Boulders in Debris Flows},
  howpublished = {EasyChair Preprint 14887},
  year      = {EasyChair, 2024}}