Les paysages de rizières et leur évolution récente dans le delta du fleuve Gianh

Abstract

From the field missions carried out in 2015 and 2016, a specific research question was gradually built up concerning the landscape of the Gianh River delta in the Quang Binh province, in central Vietnam. Since 1986, the country's renewal policy, economic liberalization and Vietnam's openness have led to the replacement of land use patterns in agricultural areas by industrial, commercial and residential areas. Since populations and agricultural activities are predominantly located in the area exposed to these risks, flood hazard maps are issued to prevent floods and implement protective measures. The objectives of these measures are to reduce the vulnerability of people and property and to help land use and development decisions, for example, prohibiting human settlements in the most dangerous areas. In a context of population growth, the decline in agricultural area and thus in total agricultural production and the number of farmers has led to a problem of food insecurity in the delta. Landscape changes due to the extension of urban constructions and demographic growth, deforestation upstream of the river or the destruction of the mangrove for the exploitation of fish farming entails environmental problems. These dynamics aggravate the effects of climate disasters. These issues must guide the orientations of management policies along the river and in the delta specifically.

Keywords

• landscape
• agriculture
• flood
• urbanization/urbanisation
• Gianh
• river