Energy & Wetlands Research Group, Centre for Ecological Sciences (CES), Indian Institute of Science, Bangalore, Karnataka, India(1); Centre for Sustainable Technologies (astra), Indian Institute of Science, Bangalore, Karnataka, India; Centre for Infrastructure, Sustainable Transportation and Urban Planning (CiSTUP), Indian Institute of Science, Bangalore, Karnataka, India.
Energy & Wetlands Research Group, Centre for Ecological Sciences (CES), Indian Institute of Science, Bangalore, Karnataka, India(1).
J Environ Manage. 2018 Jan 15;206:1263-1273. doi: 10.1016/j.jenvman.2017.07.060. Epub 2017 Aug 12.
Sedimentation involving the process of silt transport also carries nutrients from upstream to downstream of a river/stream. Sand being one of the important fraction of these sediments is extracted in order to cater infrastructural/housing needs in the region. This communication is based on field research in the Aghanshini river basin, west coast of India. Silt yield in the river basin and the sedimentation rate assessed using empirical techniques supplemented with field quantifications using soundings (SONAR), show the sediment yield of 1105-1367 kilo cum per year and deposition of sediment of 61 (2016) to 71 (2015) cm. Quantifications of extractions at five locations, reveal of over exploitation of sand to an extent of 30% with damages to the breeding ground of fishes, reduced productivity of bivalves, etc., which has affected dependent people's livelihood. This study provides vital insights towards sustainable sand harvesting through stringent management practices.
泥沙淤积涉及泥沙输移过程，也会将营养物质从河流/溪流的上游带到下游。这些沉积物的重要组成部分之一是沙子，为了满足该地区的基础设施/住房需求，需要对其进行开采。本研究基于印度西海岸阿加什尼河流域的实地研究。使用经验技术评估流域中的泥沙产量和沉积速率，并辅以使用测深仪（声纳）进行实地量化，结果显示每年的泥沙产量为 1105-1367 千立方米，沉积的泥沙量为 61（2016 年）至 71（2015 年）厘米。对五个地点的开采量进行量化，结果显示，沙子的过度开采程度达到了 30%，破坏了鱼类的繁殖地，降低了双壳类动物的生产力等，这影响了依赖该资源为生的人们的生计。本研究通过严格的管理实践，为可持续的采砂提供了重要的见解。
