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Field observation on integrated sediment management in Brantas river basin, Indonesia

印度尼西亚布兰塔斯河流域泥沙综合管理现场观察

基本信息

批准号：
15404017
负责人：
FUJITA Masaharu
金额：
$ 5.25万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15404017/
关键词：
Brantas River Integrated sediment management Sediment routine system in river basin Sediment production Bed variation Volcanic eruption Rainfall runoff Sediment runoff 土砂管理侵食インドネシア

项目摘要

The information available to the integrated sediment management of the Brantas river basin was examined by the field survey, field observation, and the simulation of bed variation. Particularly we investigated the topographical change of the main river after the eruption of Mt.Kelude in 1994 and the sediment yield and transport in M.Semeru basin considering the influence of sand mining and deforestation as human impact. Immediately after the eruption in 1994, a large amount of sediment flowed into the main river rapidly from the tributaries and a sever bed aggradation took place and the bed material became much finer. The sediment discharge from the tributaries immediately after the eruption is an essential information for the sediment management. As a result of the analysis, it was found that the condition is evaluated with the local hydraulic condition and the grain size distribution of the produced sediment. After the eruption, however, the tendency of bed variation changed quickly to the opposite. According to our survey, we can recognize the sediment movement in the tributaries even in rainy season and sand mining was very active in the main river and the tributaries. It is seemed that sand mining and irrigation cause the decrease in sediment supply and water discharge and consequently the bed level became much lower and the bed surface was covered by armor coat in the main river and tributaries. Field observation on suspended load in the main river has indicated the sediment yield of fine sediment was decreasing gradually after the eruption, but it has recently increased again. One of the reasons is the deforestation and more active sand mining. Also, field survey in Lesti river has indicated the suspended load concentration is very large in early stages of the rainy season because the farmland is disturbed by cultivation.

通过野外调查、野外观测和河床变化模拟，对布兰塔斯河流域泥沙综合管理所需信息进行了研究。特别是，我们调查了1994年克鲁德山爆发后的主要河流的地形变化和M.Semeru流域的产沙量和输沙量，考虑到采砂和森林砍伐的影响，作为人类的影响。1994年火山爆发后，大量泥沙迅速从支流流入干流，河床发生了严重的淤积，床料变得更细。喷发后支流的输沙量是沉积物管理的重要信息。作为分析的结果，它被发现，该条件与当地的水力条件和所产生的沉积物的粒度分布进行评估。但在火山爆发后，床层变化的趋势迅速改变，相反。根据调查，可以看出，即使在雨季，支流的泥沙运动和采砂是非常活跃的主要河流和支流。由于采砂、灌溉等原因，使干流和支流的输沙量和输沙量减少，河床高度降低，河床表面被装甲覆盖。对主河道悬移质的实地观测表明，火山爆发后细颗粒泥沙的产沙量逐渐减少，但近期又有所增加。原因之一是森林砍伐和更活跃的采砂。同时，在勒斯蒂河的实地调查表明，在雨季的早期阶段，由于农田受到耕作的干扰，悬浮物浓度很大。