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首页> 外文期刊>Journal of hydrology, New Zealand >Conceptualization of sediment flux in the Tongariro catchment
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Conceptualization of sediment flux in the Tongariro catchment

机译：汤加里罗流域泥沙通量的概念化

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To quantify sediment flux in river systems requires not only measurements (or estimates) of how much sediment moves through channel cross-sections or reaches over a given time period, but also consideration of how representative those measurements are and how long those rates of sediment movement will be sustained. Geomorphic analysis must accompany application of engineering principles to develop this understanding, explaining controls on sediment availability for a particular system. Geomorphic controls on sediment flux are discussed here in terms of four principles: landscape setting, landscape connectivity, reach sensitivity and sediment organization. These principles are applied in the Tongariro catchment. The landscape setting of this catchment is fashioned primarily by the volcanic history of the area, with abundant sediment supply. Landscape connectivity is limited, with many sediment stores in upland areas disconnected from the lower course of the river. Reach sensitivity downstream of the gorge is limited by the area of active channel inset within terraces. Significant channel adjustments have oc-curred in the braided reach beyond the terrace-confined reaches. This reach has acted as an efficient trap for gravel-sized materials, such that further downstream, the meandering and multi-channeled delta reaches comprise sand-sized materials. These latter reaches have shown negligible channel adjustments over the last 80 years. Collectively, these inter-related controls determine variability in sediment availability in the Tongariro catchment over time, thereby exerting a dominant influence upon sediment flux. Human disturbance is concluded to have had a negligible impact on sediment flux in this resilient system.
机译：要量化河流系统中的泥沙通量，不仅需要测量（或估计）在给定时间段内有多少泥沙穿过通道横截面或到达，还需要考虑这些测量的代表性和多长时间？将持续下去。地貌分析必须伴随工程原理的应用来发展这种理解，解释特定系统对沉积物有效性的控制。本文根据四个原则讨论了沉积物通量的地貌控制：景观设置，景观连通性，到达敏感性和沉积物组织。这些原则适用于汤加里罗流域。该流域的景观环境主要由该地区的火山历史形成，具有丰富的沉积物供应。景观连通性有限，高地地区的许多沉积物存储区与河流下游的连接断开。峡谷下游的到达敏感性受到梯田内活动通道插入区域的限制。辫状河段超出梯田限制河段时，发生了重要的航道调整。此范围已成为砾石大小的材料的有效捕集器，因此在更下游的地方，蜿蜒曲折的多道河三角洲包括沙子大小的材料。在过去的80年中，这些较后的河段在渠道调整方面可忽略不计。这些相互关联的控制共同决定了汤加里罗流域的沉积物可利用量随时间的变化，从而对沉积物通量产生主要影响。结论是，人为干扰对该弹性系统中的泥沙通量的影响可忽略不计。

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