Remote Sensing and Hydrologic-Hydrodynamic Modeling Integrated Approach for Rainfall-Runoff Simulation in Farm Dam Dominated Basin

Chaowei Xu,Hao Fu,Ziyan Han

doi:10.3389/fenvs.2021.817684

Abstract

Farm dams may exert various pressures on the flow network depending on the position and scale, which may influence the magnitude, timing, and duration of the flow in the basin. Considering the cumulative effects of farm dams is important for understanding their spatial impacts on the rainfall-runoff process. However, a few studies have been able to reckon the temporal and spatial variation in the flow. In this study, we developed an integrated approach based on remote sensing and hydrologic–hydrodynamic modeling to simulate the rainfall-runoff process in a farm dam-dominated basin. Compared with the classical Xinanjiang model (XAJ), the developed coupled hydrological–hydrodynamic model (coupled-XAJ) shows improved performance in the simulation of the no-linear confluence process in terms of flood flow and peak appearance time. It demonstrates that water retention of multiple farm dams is eminent and that the developed model is effective and feasible in farm dam-dominated basins. Furthermore, the integrated approach enables to control and utilize the rain and flood resources with the safety of arm dams guaranteed. This study provides an innovative method for the scientific management of water resources under the influence of human activities and environmental changes.

Highlights

Irrigation water allocation, which took on the largest proportion (66%) of agricultural water, has been the hardest hit by the rapid growth of water demand for non-agricultural sectors (Tingey-Holyoak, 2014)
For peak discharge, most peak discharges simulated by the Xinanjiang model (XAJ) model is larger than the observed since the retaining effect of the farm dams is not considered
The flood hydrographs closed to the actual situation verify that the coupled XAJ model plays an active role in simulating the effect of farm dams on flood peak

Summary

Introduction

Irrigation water allocation, which took on the largest proportion (66%) of agricultural water, has been the hardest hit by the rapid growth of water demand for non-agricultural sectors (Tingey-Holyoak, 2014). To address reliable supplies of water all year for irrigation and to maximize the utilization of rainwater resources, farm dams have been constructed continuously during the last few decades (Krol et al, 2011; Malveira et al, 2012; de Araujo and Medeiros, 2013). Its basic purpose is to capture runoff by the bank and barrier when it is available and store it for later use (Nathan and Lowe, 2012) They play an important role in the rural areas, especially those dominated by dryland agriculture (Sinclair, 2000; Teoh, 2002; Ashraf et al, 2007; Nathan and Lowe, 2012). Farm dams are common in many countries including the US (Ignatius and Stallins, 2011; Ignatius and Rasmussen, 2015; Ignatius and Jones, 2017), France (George, 2011; Habets et al, 2014; Habets et al, 2018), New Zealand (Kizenzle and Schmidt, 2008; Thompson, 2012), African countries

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Conclusion