International Journal of Ground Sediment & Water

Number 18, 2023

1127
Editor Board

Authors: Sun Jichao

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Editor Board © International Journal of Ground Sediment & Water, ©Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/

1141-1157
Analysis of Temporal Evolution Characteristics of Precipitation in Beijing

Authors: Zhang Chengze, Sun Jichao*

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Abstract: To master the law of precipitation evolution in Beijing and better implement the management of water resources. Based on the monthly precipitation data of Beijing from 1978 to 2020, the trend, mutation and periodicity of annual and seasonal precipitation in Beijing were studied by using linear regression, anomaly analysis, 5a moving average, Mann-Kendall mutation test and Morlet wavelet analysis. The results show that the annual, spring, summer, autumn and winter tilt rates are - 1.81mm/3a, - 0.17mm/3a, - 3.11 mm/3a, 1.42mm/3a and 0.02mm/3a respectively. The precipitation in summer decreased significantly in 2005, in autumn increased significantly in 2012, and in winter decreased significantly in 1982. There was no significant change in inter-annual and spring precipitation. The annual and seasonal precipitation had many mutations in this time series, and the mutations were 7 times, 13 times, 2 times, 5 times and 7 times respectively. There are three kinds of periodic changes in annual precipitation, and the intensity of periodic changes is the largest in the 20-32 year scale. There were 3 types, 2 types, 2 types and 2 types of periodic changes in each season respectively. The intensity of periodic changes in winter precipitation was the largest on a 10-20 year scale, and the intensity of periodic changes in the other three seasons was the largest on a 20-32 year scale. In general, the annual and seasonal precipitation in Beijing has obvious trends, mutations and periodicity, and the research results have certain reference values for Beijing water resources planning and other related work. © International Journal of Ground Sediment & Water, ©Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/

1167-1204
Engineering Geological Highway Structural Failure Assessment and Modeling of its Geotechnical Parameters: Case Study of Failed F- 209 Pavement, Southwestern Nigeria

Authors: Olumuyiwa Olusola Falowo*, Tosin Anthony Oniyelu

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Abstract: Engineering geological investigation of the soil domain along the highway alignment of F-209 connecting Akure and Ado-Ekiti Southwestern Nigeria, had been investigated to assess the structural failure of the highway. Findings showed that the subsoil delineated is characterized by resistivity ranging from 135 – 711 ohm-m (avg. 385 ohm-m) composing sandy clay and clay sand (predominant). The soils are of intermediate plasticity/compressibility; and montmorillonite clay mineralogy group. The soaked CBR/in-situ CBR values are generally less than 10% minimum specification for subgrade materials. The GI values (avg. 13) corresponded to poor subgrade soil. Based on the GI and CBR values, the recommended thickness of the pavement should range from 267 mm (good segment) to 521 mm (for the weak segment) (avg. 401 mm, but are far above the present thickness of 159 – 210 mm. Therefore the present design thickness of the highway can’t sustain the vehicular loads/haulage activities on the highway. The SNG contribution of the soil as subgrade material (avg. 0.48), strength coefficient of the soil as subbase (avg. 0.0671) and base (avg. 0.0357) in terms of SN/SNC and SNP are less than 0.5 minimum required for pavement strength/layer contribution. Parameter modelling showed all showed strong positive correlations except soaked CBR Vs in-situ and RD Vs DCPI that displayed weak positive correlations. The validity of the models is based on applicability and accuracy. Therefore, the highway failure can be attributed to weak geologic and engineering properties, coupled with inadequate design thickness and lack of drainage facility at the shoulders. © International Journal of Ground Sediment & Water, ©Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/

1215-1249
Assessment of Soil, Water and Vegetable Crops for Zinc Deficiency in Gadap Basin for Agricultural Solution

Authors: Adnan Khan*, Sara Shahwaar

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Abstract: Present study aimed to examine the impact of physico-chemical factors of agricultural soil on zinc availability for plant uptake in the Gadap Basin. Bio accessibility and availability were assessed for the vegetable and fruit plants. For this purpose, water (n = 6), soil (n=11), and plant (n=12) samples were collected from agricultural-fields. Data revealed that both water (Range: 7.14 to 8.34; mean: of 7.99) and soil (Range: 7.8 to 8.4) pH is alkaline. The soil Eh is oxic which span between +120 and+134 mV. Similarly, High soil salinity (Range: 163 to 322 mg/kg) is causing increasing soil pH, which is leading to less availability of zinc to plants. According to soil classification, soil of Gadap is found to be coarse grained where 85% of the soil retained between 60 and 100 meshes, while 5% stayed between 17 and 200 meshes, and other 10% comprises clay. The zinc concentration in soil ranged between 25–40 mg/kg, which is extremely low. On the other, hand zn concentration in plant samples is found to be 10.71mg/Kg-21.35mg/Kg. It is concluded that agricultural soil of Gadap town is deficient in Zn content which is affecting the crops nutrient index. © International Journal of Ground Sediment & Water, ©Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/