Arid
DOI10.1002/esp.4263
Estimating the sediment trap efficiency of intermittently dry reservoirs: lessons from the Kruger National Park, South Africa
Reinwarth, Bastian1; Riddell, Edward S.2,3; Glotzbach, Christoph4; Baade, Jussi1
通讯作者Reinwarth, Bastian
来源期刊EARTH SURFACE PROCESSES AND LANDFORMS
ISSN0197-9337
EISSN1096-9837
出版年2018
卷号43期号:2页码:463-481
英文摘要

The assessment of sediment yield from reservoir siltation requires knowledge of the reservoir’s sediment trap efficiency (TE). Widely used approaches for the estimation of the long-term mean TE rely on the ratio of the reservoir’s storage capacity (C) to its catchment size (A) or mean annual inflow (I). These approaches have been developed from a limited number of reservoirs (N40), most of them located in temperate climate regions. Their general applicability to reservoirs receiving highly variable runoff such as in semi-arid areas has been questioned. Here, we examine the effect of ephemeral inflow on the TE of 10 small ( 280x10(3)m(3)), intermittently dry reservoirs located in the Kruger National Park. Fieldwork was conducted to determine the storage capacity of the reservoir basins. The frequency and magnitude of spillage events was simulated with the daily time step Pitman rainfall-runoff model. Different runoff scenarios were established to cope with uncertainties arising from the lack of runoff records and imperfect input data. Scenarios for the relationship between water and sediment discharge were created based on sediment rating curves. Taking into account uncertainties in hydrological modelling, uncertainties of mean TE estimates, calculated from all scenarios (N=9), are moderate, ranging from +/- 6 to +/- 11% at the 95% confidence level. By comparison, estimating TE from the storage capacity to catchment area (C/A) ratio induces high uncertainty (ranges of 35 to 65%), but this uncertainty can be confined (15 to 33%) when the latter approach is combined with hydrological modelling. Established methods relying on the storage capacity to mean annual inflow (C/I) ratio most probably lead to an overestimation of the TE for the investigated reservoirs. The approach presented here may be used instead to estimate the TE of small, intermittently dry reservoirs in semi-arid climate regions. Copyright (c) 2017 John Wiley & Sons, Ltd.


英文关键词reservoir siltation sediment retention episodic spillage Pitman model sediment rating curve
类型Article
语种英语
国家Germany ; South Africa
收录类别SCI-E
WOS记录号WOS:000424164000009
WOS关键词RAINFALL-RUNOFF MODEL ; NORTHERN ETHIOPIA ; FEBRUARY 2000 ; CATCHMENT ; YIELD ; RIVER ; PONDS ; SILTATION ; TRANSPORT ; SAVANNA
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/208621
作者单位1.Friedrich Schiller Univ, Dept Geog, Lobdergraben 32, D-07743 Jena, Germany;
2.Univ KwaZulu Natal, Ctr Water Resources Res, Pietermaritzburg, South Africa;
3.South African Natl Parks, Conservat Management, Skukuza, South Africa;
4.Univ Tubingen, Dept Geosci, Tubingen, Germany
推荐引用方式
GB/T 7714
Reinwarth, Bastian,Riddell, Edward S.,Glotzbach, Christoph,et al. Estimating the sediment trap efficiency of intermittently dry reservoirs: lessons from the Kruger National Park, South Africa[J],2018,43(2):463-481.
APA Reinwarth, Bastian,Riddell, Edward S.,Glotzbach, Christoph,&Baade, Jussi.(2018).Estimating the sediment trap efficiency of intermittently dry reservoirs: lessons from the Kruger National Park, South Africa.EARTH SURFACE PROCESSES AND LANDFORMS,43(2),463-481.
MLA Reinwarth, Bastian,et al."Estimating the sediment trap efficiency of intermittently dry reservoirs: lessons from the Kruger National Park, South Africa".EARTH SURFACE PROCESSES AND LANDFORMS 43.2(2018):463-481.
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