期刊
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
卷 56, 期 2, 页码 319-333出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02626667.2011.553616
关键词
reservoir network; siltation; sediment yield; semi-arid watershed; Brazil
资金
- CAPES (Coordination for the Improvement of Higher Education Personnel)
- CNPq (National Council of Technological and Scientific Development)
- CONECTE [471101/2007-9]
- FINEP [2073/07]
This paper investigates for a 25-year period the sediment distribution in a semi-arid Brazilian basin (2 x 10(4) km(2)) with a network containing more than 4000 surface reservoirs. The methodology is based on rating curves and fitted parameters derived from field data. The results showed that suspended load corresponded to 70% of the total sediment yield (148 t km(-2) year(-1)). The relatively low contribution of the suspended load (compared with other semi-arid regions) was attributed to the impact of the numerous upstream reservoirs, which retained 235 t km(-2) year(-1). The micro (<1 hm(3)), small (1-10 hm(3)), medium-sized (10-50 hm(3)), and large or strategic (>50 hm(3)) reservoirs responded to, respectively, 5, 17, 30 and 48% of the total sediment retention by the reservoir network. This indicates that retention in the non-strategic reservoirs has a positive impact on water availability, since siltation of the strategic reservoirs would be expected to more than double if only such reservoirs existed.
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