River channel adjustment and sediment budget in response to a catastrophic flood event (Lainbach catchment, Southern Bavaria)
River channel adjustment and sediment budget in response to a catastrophic flood event (Lainbach catchment, Southern Bavaria)
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应对灾难性洪水事件的河道调整和沉积物预算（兰巴赫流域，巴伐利亚南部）
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
K. Schmidt
中科院分区：
文献类型：
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作者：
K. Schmidt
1990 年夏天，莱恩巴赫流域经历了一场由雷暴引发的洪水，其复发间隔远远超过 100 年，其规模是以前从未有过的。莱恩巴赫洪水的影响可以在现场直接观察到。对于120 m长的测量河段，洪水后绘制了新的地形图，其分辨率与1988年绘制的底图相同（0.1米等高线）。通过比较，提供了河床变化的详细信息。通过洪水前和洪水后的纵向和横向剖面调查，计算了兰巴赫和科特兰河段的沉积物预算。被侵蚀的河道沉积物的主要来源位于溃坝的上游。坡度较低的河段通常受高累积率的影响最大。在大地测量范围内，积累的物质远多于侵蚀的物质，导致总体物质平衡盈余约为 35000 立方米。这些物质的很大一部分在支流河道和坡沟中流动。斜坡崩塌的重要性不大，将这一灾难性事件描述为河道洪水。洪水使航道系统发生了根本性的转变。
In summer 1990 the Lainbach catchment experienced a thunderstorm-induced flood with a recurrence interval far in excess of 100 years of a magnitude never registered before. The Lainbach has and the effects of the flood could be observed directly in the field. For the 120 m long measuring reach a new topographic map was drawn after the flood on the same level of resolution (0.1 metre contours) as the basemap produced in 1988. A comparison gave detailed information on river bed changes. Using pre-flood and post-flood longitudinal and cross profile surveys, sediment budgets were calculated for the mountain reaches of the Lainbach and Kotlaine. The main sources of eroded channel sediments lay upstream of the broken check dams. River segments with low slopes were generally most affected by high accumulation rates. In the geodetically surveyed reaches considerably more material was accumulated than eroded, resulting in an overall mass balance surplus of about 35000 m3. A large part of this material was mobilized in the tributary channels and slope rills. Slope failures were only of minor importance, characterizing this catastrophic event as a channel flood. The flood caused a fundamental transformation of the channel system.