Moussé Landing Sane, S. Sambou, Issa Lèye, D. Ndione, S. Diatta, I. Ndiaye, M. Badji, Seïdou Kane
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The \nmain objective of the paper is to calibrate and validate the SWAT model on the \nwatershed of Bafing located between 10°30' and 12°30' \nnorth latitude and between 12°30' and 9°30' west longitude to assess climate change \non this river flows. A DEM with a resolution of 12.5 m × 12.5 m, the daily average flows and the \ndaily observed precipitations on the period 1979-1986 (long period) are used as \ninputs for the calibration, while precipitations for the period 1988-1994 are \nused for the validation. The sensitivity analysis was done to detect the most \ndetermining coefficients during the calibration step. It shows that 19 \nparameters are required. Then, the effect of the period on the parameters \ncalibration is checked for using first the whole period of study and then each \nyear of the period of study. The Nash criterion was used to compare the \ncalculated and the observed hygrographs in each case. 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引用次数: 4
摘要
水库水资源的管理需要了解该水库的流量输入。为此,采用了水文降雨径流模型。根据水文过程的描述,水文模型有几种类型:黑箱模型、概念模型、确定性物理模型。SWAT是针对水质和水量设计的半分布式水文模型。这一多功能工具已在世界各地用于评估和管理水资源。本文的主要目的是在北纬10°30′~ 12°30′、西经12°30′~ 9°30′之间的八滨流域对SWAT模型进行标定和验证,以评估该河流流量的气候变化。采用分辨率为12.5 m × 12.5 m的DEM、1979-1986年(长周期)的日平均流量和日观测降水作为定标输入,1988-1994年的降水用于验证。进行灵敏度分析以检测校准步骤中最重要的决定系数。显示需要19个参数。然后,首先使用整个研究期间,然后使用研究期间的每一年,检查周期对参数校准的影响。采用纳什判据来比较每种情况下的计算值和观测值。结果表明,标定周期越长,Nash准则的精度越高。每年的校准给出了最佳纳什标准,除了单一年份。在验证过程中,通过长周期的参数计算得到最佳纳什准则。纳什准则的校正和验证值是非常合适的。这些校正结果可用于研究巴冰马卡纳塞内加尔河流量的长期演变。
Calibration and Validation of the SWAT Model on the Watershed of Bafing River, Main Upstream Tributary of Senegal River: Checking for the Influence of the Period of Study
Management of reservoir water resources requires the
knowledge of flow inputs in this reservoir. Hydrological rainfall-runoff model
is used for this purpose. There are several types of hydrological model
according the description of the hydrological processes: black-box models,
conceptual models, deterministic physical based model. SWAT is a semi-distributed
hydrological model designed for water quality and quantity. This versatile tool
has been used all around the world to assess and manage water resources. The
main objective of the paper is to calibrate and validate the SWAT model on the
watershed of Bafing located between 10°30' and 12°30'
north latitude and between 12°30' and 9°30' west longitude to assess climate change
on this river flows. A DEM with a resolution of 12.5 m × 12.5 m, the daily average flows and the
daily observed precipitations on the period 1979-1986 (long period) are used as
inputs for the calibration, while precipitations for the period 1988-1994 are
used for the validation. The sensitivity analysis was done to detect the most
determining coefficients during the calibration step. It shows that 19
parameters are required. Then, the effect of the period on the parameters
calibration is checked for using first the whole period of study and then each
year of the period of study. The Nash criterion was used to compare the
calculated and the observed hygrographs in each case. The results showed that
the longer is the period of calibration, the more accurate is the Nash
criterion. The calibration per year gave a best Nash criterion except for a
single year. During the validation, the parameters calculated on the long
period lead to the best Nash criterion. The values of the Nash criterion
calibration and validation are very suitable. These results of calibration can
be used to study the long-term evolution of flow at Senegal River on Bafing
Makana.